Skip to main content

Filter By:

  • Show More Brands

  • Show Fewer Brands
  • Show More Sizes
  • Show Fewer Sizes
  • Show More Model Years
  • Show Fewer Model Years

Adults

$159.00
The MET Estro MIPS is a versatile road helmet ready for your longest day on the bike. As comfortable as a top-of-the-line helmet, its design is widely open to maximize ventilation at low speeds. With 26 vents, 17 of which are inlets and 9 are exhaust holes, all of them work in synergy with the internally engineered air channeling system to ensure maximum ventilation. The Estro MIPS is also exceptionally comfortable. The 360° head belt in the MET Safe-T Upsilon retention system ensures that there will be no pressure points on the skull, and its internal shape is welcoming for almost all different shaped heads. Featuring the MIPS-C2 brain protection system, the MET Estro MIPS is able to slide against the head in the event of a crash, redirecting damaging rotational motion. MIPS is a brain protection system—engineered to add protection to the standard construction of helmets in case of certain impacts. The MIPS Brain Protection System (BPS) is attached inside the helmet, between the comfort padding and the EPS. The front of the helmet features two dedicated ports for securely docking sunglasses while resting or climbing. The design reflects the purpose - to adapt to various uses and environments. Widely open, deeper coverage, a versatile visor, and a full polycarbonate wrap that makes it more durable by avoiding exposure of EPS surfaces to outdoor conditions. - In-mold polycarbonate shell with EPS liner - Full polycarbonate wrapped EPS liner to enhance durability - Extended head coverage for more thorough skull protection - MIPS-C2 Brain Protection System add protection in case of certain impacts - MET Safe-T Upsilon Fit System - 360° head belt and vertical adjustments offer a customized fit - Air Lite straps with adjustable divider maximize aerodynamics and comfort - Sunglass ports to securely dock sunglasses - 26 vents are internally engineered for air channeling to improve ventilation and comfort - Comfort pads are hand-washable - Certifications CE; AS/NZS; US
$109.99
The M1 Full Face Helmet is perfect for anything from racing to full days of uplifting or bike park laps. Our M1 Helmet is the ideal helmet to keep you protected and comfortable. Features: - Lightweight ABS Shell - 17 Vents provide cool air intake and heat exhaust - Large eye port for greater field or vision and improved goggle fit - 4 colors - 7 sizes - Complies to CE, SPSC and AS Standards
$104.99
A stylish road helmet with advanced WaveCel technology that balances comfort and performance for all riders who value safety. A MAJOR ADVANCEMENT IN THE PROTECTION AGAINST CYCLING-RELATED HEAD INJURIES Starvos WaveCel is a versatile, high-value cycling helmet for new-to-seasoned riders who want WaveCel, a leading technology in the protection against cycling-related head injuries. WaveCel is a collapsible cellular structure that lines the inside of the helmet. This Trek-exclusive technology disrupts the safety standards the industry has accepted for over 30 years. PRODUCT DETAILS - WaveCel advanced helmet technology - Intuitive, one-handed Headmaster fit system makes adjustments easy - LockDown dividers make helmet strap management clean and easy to adjust - Soft, comfortable, and moisture-wicking washable helmet pads - Available in XS and XL sizing - Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership - Complies with U.S. CPSC safety standards for bicycle helmets for persons age 1 and over
$99.99
Built for the wanderer in you. Finally a helmet for everyone. Whether you're a commuter, riding gravel, or just like to ride your bike to meet friends for coffee, the Nutcase VIO Adventure doesn't discriminate. - Made with Nutcase's exclusive and patented Exoskeleton technology with a 2-piece in-mold Duo Density EPS foam construction - A denser outer layer of foam protects your head in an and a softer inner layer that cushions the brain after initial impact, providing the double protection - Features MIPS technology (Multi-directional Impact Protection System) that helps protect against angled impact - Cradle is adjustable for superior comfort - Fidlock magnetic closure for easy on and off - 9 vents to help keep you cool - Premium heat sealed Static X Anti-microbial pads to keep the stink away - Reflective front and rear logos
$69.99
The perfect lightweight helmet offers great head coverage for ultimate protection. This is a lot of helmet for the price. It offers extensive protection around the head and deeper rear coverage. It also includes Leatt’s 360 Turbine technology, which is proven to reduce the risk of concussion by up to 30% and rotation forces upon impact by 40%. With 14 vents and Maxiflow air channels, the lightweight construction also offers great ventilation for those hot days. Details: - Polymer Compound shell in three sizes - MaxiFlow impact foam air channels are effective even at low speed - 360° Turbine Technology - Reduced peak brain acceleration by up to 30% at impact speeds associated with concussion - Reduces peak brain rotational acceleration by up to 40% - Extended rear coverage for added protection - Adjustable visor with breakaway function for rotational impact force reduction - In-molded impact foam for great energy absorption - Maximized ventilation with 14 vents effective even at low speeds - Moisture-wicking, breathable, and washable inner liner - Weight: from 320g (0,70 lbs) - Certified and tested: AS/NZS 2063:2008, EN1078, CPSC 1203
$89.99
- Zip Mold + construction - EZ-Fit retention system - 13 vents - Bike light compatible - Removable flip visor - CPSC standards EN1078 Helmet sizing: - Small: 52 - 55.5cm - Medium: 55.5 - 59cm - Large: 59 - 62cm
$260.00
The brand new DH Invader takes this proven category leader to a new level with added protection. The brand new Invader DH takes this proven category leader to a new level with added protection making an already great helmet perfect for riding between the tape, double black diamond runs and anywhere else you’re dreaming of going big. - RHEON Low Density Layer - Composite Fusion - Unibody Construction with a Monocoque Chin Bar - Adjustable, Moto-Style Visor - Anti-Microbial Pads - Accessory Mounting System - FidLock Magnetic Buckle - Frequency Fit System - Lifetime Crash Replacement - CERTIFICATIONS: CPSC, EN 1078, ASTM Rated for Downhill
$259.99
The most versatile helmet you can buy! The Enduro 3.0 helmet offers three different levels of protection. Wear the half shell for those light trail days or attached the over-ear coverage for slightly more aggressive trails. For total protection clip in the chin bar for full-face protection when you need it! Made from a lightweight polymer shell, the Enduro 3.0 helmet features a Powerbridge construction for greater shell strength. The Enduro 3.0 helmet also features 360 ° Turbine Technology. These small blue 360-moving discs are constructed from an energy-absorbing shape and material. This tech has two exclusive advantages, namely the reduction of rotational acceleration to the head and brain and the absorption of energy upon impact at the concussion level. The micro adjuster at the back ensures the perfect fit. There is also a sunglasses docking port to stash your sunnies when you don’t need them. The visor is adjustable and has a breakaway function for extra rotational impact force reduction. Choose your style and be ready for any trail with the 3-in-1 enduro helmet. Details: - Lightweight polymer shell in three sizes - Powerbridge top shell construction for greater load distribution - 3-IN-1 helmet design: 1) Half-shell open-face helmet 2) Removable chin bar with easy push-button system 3) Removable over-the-ear guards with an easy push-button system - Sunglasses dock port for easy, secure storage. - Fidlock magnetic closure system - 360° Turbine Technology - Reduced peak brain acceleration by up to 30% at impact speeds associated with - concussion - Reduces peak brain rotational acceleration by up to 40% - Adjustable visor with breakaway function for rotational impact force reduction - In-molded impact foam for superior energy absorption - Maximized ventilation with 20 vents effective even at low speeds - Moisture-wicking, breathable, anti-odor, and washable inner liner - Weight: From 700g (1.54 lbs). Without chin bar: from 360g (0.79 lbs) - Certified and tested: AS/NZS 2063:2008, EN1078, CPSC 1203, ASTM F1952–10
$200.00
The Kali Grit Helmet is designed for performance road cycling. It features a Rheon Low-Density Layer (LDL) to protect you in the case of low-G linear or rotational impacts, and Kali's proprietary Supervents to increase overall strength and help with ventilation. The Grit also features the Frequency Fit System, with vertical adjust and dial retention, Fixed Strap Intersections, Unibody Construction and a Rollcage Internal PC Bridge, for added strength. - Rheon Low-Density Layer (LDL) reduces rotational impact forces up to 25% and reduces low-g linear forces up to 30% - Supervent: injection molded skeletal structure for added strength and larger volume intake vents - Frequency Fit System, with dial and vertical adjust offers three positions for maximum comfort and fit - Fixed Strap Intersections: Stops the straps from twisting, while keeping them flush against your face - Unibody Construction: Couples the upper and lower shells for a dialed fit and finish, while adding strength - Rollcage Internal PC Bridge: Used to increases the overall strength of the helmet
$159.99
The Pedelec 2.0 offers an uncompromising combination of comfort and protection. Complemented by clever features, it is the ideal companion when cycling in road traffic. - In-Mold for a durable connection with the outer shell with shock-absorbing helmet material (EPS) - Forced Air Cooling Technology ventilation system keeps you cool and comfortable with 4 air inlets and 9 air outlets connected with flow channels - Zoom Ace Urban adjustment system with handy adjustment wheel for a customizable fit - Size adjustment by means of a half-ring made from particularly hard-wearing and slightly malleable plastic for optimal stability and fit - High visibility due to powerful reflectors and an integrated LED taillight with 180-degree visibility - Foamed-in fly nets keep insects out - Lower edge protection provides the helmet with additional protection from external influences - Fidlock magnetic strap buckle - Ponytail-compatible and well suited for braided hairstyles Sizing: - Medium: 52 – 57cm - Large: 56 – 62cm
$219.00
The MET Roam MIPS is designed for all-mountain and enduro riding. The back of the head and the temples are especially in need of protection from impact, so we’ve increased the coverage around these key areas, without sacrificing the helmet’s light weight. The injection-molded visor is flexible to adapt to the shell of the helmet in a crash. This unique feature helps to manage extra rotational forces transferred to your neck. There are clips on the visor and a rear edge, which keep goggle straps in place during the ride, achieving ultimate compatibility with your eyewear. Featuring the MIPS-C2 rotational management system, the Roam is able to slide against the head in the case of a crash, redirecting damaging rotational motion. The MIPS-C2 solution separates the shell and the liner with a thin plastic Low Friction Layer (LFL). The Roam Mips features 22 vents that work together with the purpose-built internal channel to provide optimal airflow at high and low speed. The MET Roam has also been rewarded for its comfortable fit. The inner padding has an extended surface area which provides the perfect stability without disturbing internal airflow. - In-mold polycarbonate shell with EPS liner - Fully polycarbonate wrapped EPS liner enhances durability - Extended head coverage for more thorough head protection - Exceptionally comfortable and secure on the head thanks to a refined internal shape and stabilizing inner padding - MIPS-C2 Brain Protection System offers extra protection in the case of certain impacts - MET Safe-T Orbital Fit System - The 360° head belt with vertical and occipital adjustments help to maximize adjustability - The injection-molded visor is adjustable and flexible to avoid extra rotation of the neck in case of a crash - Integrated goggle strap clips and sunglass ports to securely dock eyewear when climbing or resting - 22 vents are internally engineered for air channeling to improve ventilation and comfort - Certifications CE; AS/NZS; US Sizing: - Small = 52 – 56cm - Medium = 56 – 58cm - Large = 58 – 62cm
$55.00
Inspired by gravity riders and presenting a modern mountain biking style, this off-road helmet is designed with generous ventilation and added protection Along with essential safety features like MIPS technology, we’ve added a lower rear coverage design to shield more of the back of your head. Direct Flow Cooling channels are designed to pull in air to keep you cool during slow, challenging climbs or flowy descents. With a one-handed dial adjustment and rear fit system you get perfect head-hugging comfort. - Contemporary, clean and compact helmet shape offers stylish looks at an accessible price point. - Numerous broad vents provide maximum air flow. - Dropped rear section for extended protection on the back of the head. - All-new 360 degree Cinch One MIPS fit system with intuitive one-handed dial adjustment for comfort and balance. - In-molded construction. - TransTextura moisture-wicking, anti-odor inner padding. - MIPS Protection. - Integrated magnetic mount for the Numen Alumbra TL and Recon TL.
$79.00
The MET Downtown MIPS is a truly modern touring helmet, ready for a weekend trek or the daily bicycle lane. The internal air-channeling and large number of vents provide exceptional ventilation. The 360° head belt and lightweight design ensures that there will be no pressure points on the skull. Featuring the MIPS-C2 rotational management system, the Downtown is able to slide against the head in the case of a crash, redirecting damaging rotational motion. MIPS is engineered to add extra safety to the standard construction of helmets in case of certain impacts. The MIPS Brain Protection System (BPS) is attached inside the helmet, between the comfort padding and the EPS. - In-mold polycarbonate shell with EPS liner - MIPS-C2 Brain Protection System offers extra protection in the case of certain impacts - Safe-T Twist 2 Fit System - 360° head belt and vertical adjustments offer a customized fit - Straps with an adjustable divider provide a customized fit - Reflective rear decal to enhance visibility - 17 vents are internally engineered for air channeling to improve ventilation and comfort - Comfort pads are hand-washable - CE; AS/NZS; US Sizing: - Small/Medium = 52 – 58cm - Medium/Large = 58 – 61cm
$79.00
MET Miles MIPS is a touring helmet with road spirit. It has a comfortable shape and plenty of vents to enhance air flow. Featuring the MIPS-C2 brain protection system, the Miles is able to slide against the head in the case of a crash, redirecting damaging rotational motion. MIPS is engineered to add extra safety to the standard construction of helmets in case of certain impacts. The MIPS Brain Protection System (BPS) is attached inside the helmet, between the comfort padding and the EPS. The unique 360° head belt ensures that there will be no pressure points on the skull, allowing you to achieve the perfect fit. - In-mold polycarbonate shell with EPS liner - MIPS-C2 Brain Protection System offers extra protection in the case of certain impacts - Safe-T Twist 2 Fit System - 360° head belt and vertical adjustments offer a customized fit - Straps with an adjustable divider provide a customized fit - Reflective rear decal to enhance visibility - 18 vents are internally engineered for air channeling to improve ventilation and comfort - Comfort pads are hand-washable - Reflective rear decal - Certifications: CE; AS/NZS; US Sizing: - Small/Medium = 52 – 58cm - Medium/Large = 58 – 61cm
$79.99
The Nutcase Street Helmet collection combines the industry leading safety feature MIPS with original Nutcase inspiring designs. Featuring an improved retention system to provide a secure, comfortable fit and 2x the reflectivity for visibility on the road. 11 air vents increase the airflow to keep your brain cool and creative designs to keep you looking even cooler. - Equipped with MIPS (Multi-directional Impact Protection System) designed to reduce rotational forces that can result from certain impacts - High performing injection molded ABS shell and tuned EPS foam to keep you safe on the road - Improved ventilation to keep you cool - Premium Fidlock magnetic closure for one handed snap and go buckle - 3 piece internal heat sealed pads to provide next to brain comfort - Simple dial adjustable fit system provides safety, individualized fit and comfort - 2x reflectivity for increased visibility on the road - Eleven vents with internal channels in EPS for ventilation - Visor Included - CPSC 16 CFR 1203 and ASTM F1492 certified for cycling, scooting, and skating
$99.99
This all-mountain helmet is light, extremely well ventilated and extremely comfortable. It is perfect for racing or everyday off-road use. - In-Mold for a durable connection with the outer shell with shock-absorbing helmet material (EPS) - Good ventilation with 5 air inlets and 7 air outlets connected with flow channels - Semi-enclosing plastic ring connected to the adjustment system for optimum stability and form-fitness - Bottom edge protects the helmet from external influences - ActiCage, a structural reinforcement integrated in the EPS to optimise stability - Zoom Ace adjustment system with non-slip adjustment wheel for individual fit - Ponytail compatible and well suited for braided hairstyles
$119.00
- Bold dramatic features with aggressive angles while maintaining core ventilation and maximum protection - Lightweight ABS shell with large angular vents to increase cold air intake and allow for hot air to escape - Large sculpted eye port for great vision
$159.99
- 23 big bore vents for no compromise airflow - The most ventilated full-face hard shell helmet on the market - ABS shell offering shock absorbency and incredible value for the money - CRV (crash Release Visor) system allows visor to release on impact
$149.95
- COB LED Technology: it's a more compact footprint while delivering a higher intensity of light, meaning you'll be seen from further away and gives the lights a more uniform look - The helmet will be equipped with 98 COB LEDs in total - Front Light (30 COB LED diodes) - Rear Lights with Turn Signals (34 red COB LED diodes, 34 orange COB LED diodes) - 1100mAh rechargeable battery providing up to 10 hours with the lights set on maximum brightness - USB-C Charging Connection (Chargeable with a 5V—5.2V & 0.5A charger) - Remote included for turn Signal - Option to buy a Lumos Remote to activate Automated Brake Lights. (The Remote Lite included with Ultra doesn't come with an accelerometer and can only be used to activate turn signals) - Lumos Companion App: Customize your light flashing patterns, check your battery life, track your activity, and sync with Strava and Apple Health - Maximum Venting - MIPS technology Sizing: - Small: 51 – 55cm / 20 – 21.6" - Medium/Large: 54 – 61cm / 21.3 – 24" - X-Large: 61 – 65cm / 24 – 25.6"
$55.00
Inspired by gravity riders and presenting a modern mountain biking style, this off-road helmet is designed with generous ventilation and added protection Along with essential safety features like MIPS technology, we’ve added a lower rear coverage design to shield more of the back of your head. Direct Flow Cooling channels are designed to pull in air to keep you cool during slow, challenging climbs or flowy descents. With a one-handed dial adjustment and rear fit system you get perfect head-hugging comfort. - Simple, clean and compact helmet shape - Optimized vent design for enhanced breathability - MIPS brain protection system and lower rear coverage - New 360° full surround fit-belt - Intuitive one-handed dial adjustment (Cinch ONE fit system) - Compatible with Alumbra taillight: Liv proprietary taillight docking station - In-molded construction for added strength - TransTextura moisture-wicking, anti-odor inner padding - Pony-tail friendly rear fit system space - Detachable visor - S / M (49-57cm), M / L (53-61 cm)
$50.00
- In-molded construction - TransTextura moisture-wicking, anti-odor inner padding - MIPS Protection - Optional visor
$249.99
The GameChanger sets new standards. What is a cyclist's biggest enemy? Air resistance. Every cyclist knows that battling against the wind is one of the toughest challenges they face. With its Multi Position Design, the GameChanger redefines aerodynamics. The special shape reduces air resistance by minimizing exposed surfaces regardless of weather conditions, head-tilt position, and inflow angle. Our innovative Forced Air Cooling Technology sucks in incoming air and channels airflow around the head, creating a perfect climate and keeping your head cool, even in hot races. - Multi Position Design: For optimal aerodynamics regardless of head tilt - Forced Air Cooling Technology: Sophisticated ventilation system for an optimal head climate - FlowStraps: Aerodynamic, flutter-free, and skin-friendly thanks to specially developed strap profile - Zoom Ace: Finely adjustable adjustment system with handy adjustment wheel for customizable fit - AirPort: Aerodynamic glasses holder with strap guide - Multi Shell In Mold: For safe shock absorption - Ponytail compatibility: Helmet well suited to plait wearers Sizing: - Small: 51 – 55cm - Medium: 52 – 58cm - Large: 59 – 62cm
$549.00
The Bluegrass Legit Carbon Helmet is a premium race-day full-face helmet. Developed for competitions, it exceeds all of the certifications for racing downhill and enduro. - The Legit Carbon features a flexible safety-release visor to avoid twisting of the neck in impacts from any angle. - Designed with hearing vents to help riders maintain balance and hit their optimum performance levels - The Legit Carbon uses a carbon fiber outer shell paired with a multi-impact EPS liner to achieve the finest blend of high-impact performance and low-weight - Vents and air channeling are optimized for all-day park sessions, with two large exhausts working in synergy with the EPS channels, to keep you cool at both high and low speeds - Featuring the MIPS E5-4® brain protection system, the BLUEGRASS Legit Carbon is able to slide relative to the head in the case of a crash, redirecting damaging rotational motion - The Legit Carbon is suitable for all head shapes and sizes, thanks to its meticulously refined internal shaping - The comfort is boosted even more by the snap-in soft padding - Durability and quality are enhanced by an injected PU foam paired with the chin guard and three polycarbonate shells strategically molded on the EPS liner
$190.00
Designed with the speed of pro riders in mind, the Bluegrass Rogue Core MIPS is sharp, bold, and alternative. It's designed to properly protect the most sensitive head areas, the back, and the temples. - The Rogue Core Mips exceeds worldwide certifications and performs best at both linear and rotational impact thanks to its meticulously engineered EPS shell and the MIPS-C2® brain protection system attached inside the helmet - The visor is designed to enhance safety and protect from branches - In the event of a crash, the visor will adapt to the shell of the helmet to help withstand extra rotational forces transferred to the neck - The Safe-T Heta retention system provides an exceptional fit and keeps the helmet stable on the head - The 360° head belt ensures that there are no pressure points on the skull, while vertical adjustments provide a custom fit - The edge at the back of the helmet is designed to properly keep the goggle strap in place - Sunglasses can be securely docked into the two visor vents - The straps anchors are embedded into the EPS and you can quickly fasten them thanks to the Fidlock® magnetic buckle, even while wearing gloves
$250.00
The Bluegrass Legit Helmet is a budget-friendly full-face helmet equipped with many racing-inspired features. - Fiberglass outer shell with EPS liner for optimal fit - Safety-release visor system includes a flexible visor to manage twisting forces - Includes 11 vents and a breathable chin guard for comfort - Designed with hearing vents to help riders maintain balance and hit their optimum performance levels - Allows for a wide field of vision and is goggle-compatible - Soft back-head support makes this helmet exceptionally comfortable - Fully removable, hand-washable padding - MX-style straps and a double-D buckle
$124.99
- Bern's entry into the road helmet market with a lightweight, aerodynamic design with max ventilation - MIPS equipped for maximum protection - Lightweight and breathable 360-degree adjustable Bern Yoke fit system developed with Boa - Reinforced in-mold EPS construction with 18 total vents - Interior air flow channels for added ventilation - Built-in sunglass storage on the shell exterior - Antimicrobial comfort padding - Small: 52-55.5cm, Medium: 55.5-59cm, Large: 59-62cm - 287g
$189.99
The combination of innovative design, the latest technology, outstanding functionality, maximum ventilation, and low weight make the Aventor a real allrounder. The Aventor is the perfect helmet for cyclists who need a cool head for riding in high temperatures and on challenging stages. - Double shell, in-mold construction for durable fusion of the outer shell with the shock-absorbing helmet material (EPS) - Lower edge protection provides the helmet with additional protection coverage - ActiCage, structural reinforcement integrated into the EPS, optimizes stability - Zoom Ace, fine adjustment system with handy dial provides a personalized fit - Half-surrounding plastic ring connected to adjustment system - Ponytail compatible - Fidlock magnetic strap buckle Sizing: - Small: 51 – 55cm - Medium: 54 – 58cm - Large: 57 – 61cm
$99.99
- Compass fit - 11 vents with increased air flow - Compatible with click-mount light - Lightweight - Integrated brim - Lay flat strap dividers - Compression molded pads - Light & durable dual shell - Snowsport knit compatible - Average weight: 390g(mips) - MIPS: multi-directional impact protection system
$249.99
AERODYNAMICS REDEFINED The GameChanger sets new standards. What is a cyclist's biggest enemy? Air resistance. Every cyclist knows that battling against the wind is one of the toughest challenges they face. With its Multi Position Design, the GameChanger redefines aerodynamics. The special shape reduces windage by minimizing exposed surfaces, regardless of weather conditions, head-tilt position and inflow angle. Our innovative Forced Air Cooling Technology sucks in incoming air and channels airflow around the head, creating a perfect climate and keeping your head cool even in hot races. - Multi Position Design: For optimal aerodynamics regardless of head tilt - Forced Air Cooling Technology: Sophisticated ventilation system for an optimal head climate - FlowStraps: Aerodynamic, flutter-free and skin-friendly thanks to specially developed strap profile - Zoom Ace: Finely adjustable adjustment system with handy adjustment wheel for customizable fit - AirPort: Aerodynamic glasses holder with strap guide - Multi Shell In Mold: For safe shock absorption - Ponytail compatibility: Helmet well suited to plait wearers
$54.99
The Scraper 3.0 is just as much at home on the bike as in the halfpipe, protecting the BMX rider as reliably as the longboard fan. And, with the optional winter kit, you can get after it in all types of weather. The intelligent ventilation system, with its many inlets and outlets, and the numerous adjustment options that adapt the Scraper 3.0 to each head in a few easy steps, ensure the greatest possible comfort. - ABS hard-shell technology - High visibility due to powerful reflectors - Ponytail compatibility: Helmet well suited to plait wearers - Forced Air Cooling Technology: Sophisticated ventilation system for an optimal head climate - Excellent ventilation with 4 air inlets and 4 air outlets - Size adjustment by means of a half-ring made from particularly hard-wearing and slightly malleable plastic for optimal stability and fit - Zoom Ace Urban: Finely adjustable fit system with a handy adjustment wheel Sizing: - Medium: 54 – 58cm - Large: 57 – 62cm