Leatt AllMtn 3.0 MTB Helmet Description The AllMtn 3.0 helmet is built for riders who want confident protection, trail-tuned features, and all-day comfort on demanding terrain. Leatt&&';;s 360Adeg Turbine Technology helps reduce rotational forces and absorb low-speed impact energy, while the in-molded PowerBridge and impact foam provide high-speed impact protection-working together as a 3-in-1 safety system. The lightweight polymer shell has 20 vents for great ventilation, and a moisture-wicking, breathable liner keeps sweat under control. With a Fidlock magnetic buckle for easy one-handed closure and an adjustable breakaway visor, the AllMtn 3.0 is built for big rides on wild trails. Features SHELL: Lightweight polymer shell3-IN-1 SAFETY SYSTEM: When combined with the impact foam, 360Adeg Turbine Technology offers a unique 3-in-1 safety system by protecting against low-speed impacts, high-speed impacts, and rotational forces.IMPACT FOAM: PowerBridge in-molded force absorber a In-molded impact foam for superior energy absorptionTURBINES: 360Adeg Turbine Technologya Rotation protection: The optimally designed turbine discs enable the helmet to move slightly on the head upon impact, helping to reduce peak acceleration to the head & brain.a Low impact protection: The special energy absorbing material in the turbines absorbs low impact energy associated with concussion.VENTILATION: 20 vents effective even at low speedsLINER: Moisture wicking, breathable, anti-odor and washable inner linerFIT SYSTEM: Flat Lock Strap divider and fit system developed for custom fit, ease, and comfortCLOSURE: Fidlock magnetic closure systemVISOR: Adjustable visor with breakaway function for rotational impact force reductionOTHER FEATURES: Sunglasses dock port for easy, secure storage a Soft touch and moisture wicking chin straps a Plastic-free packagingWEIGHT: From 350g (0.78 lbs)CERTIFICATIONS: AS/NZS 2063:2008, EN1078, CPSC 1203CRASH REPLACEMENT: 3-year Leatt Helmet Replacement ProgramSIZES:S: 51-55 cm (20-21 58 in)M: 55-59 cm (21 58-23 A 1/4 in)L: 59-63 cm (23 A 1/4-24 3/4 in)