Leatt Helmet MTB Gravity 2. 0Full-Face Protection The Leatt Gravity 2. 0 helmet delivers full-face protection for downhill, enduro, and bike park riders who want ASTM-certified safety without a premium price tag. Built around a tough polymer shell, it features Leatt's 360deg Turbine Technology to help reduce rotational forces and absorb low-speed impact energy. Paired with impact-absorbing foam, the system creates a 3-in-1 safety system for confident riding on technical terrain. The vents are covered with stainless steel mesh to block out debris, dirt, and bad weather, offering extra protection when conditions get rough. With a washable comfort liner, neck brace compatibility, and extended size range, the Gravity 2. 0 brings essential coverage and thoughtful features in a value-driven package. Features360deg Turbine Technology offers a unique 3-in-1 safety system by protecting against low-speed impacts, high-speed impacts, and rotational forces 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 The special energy-absorbing material in the turbines absorbs low-impact energy associated with a concussion SPECIFICATIONSCore Material EPS Impact Foam Closure system DD Ring Closure System Safety Certifications AS/NZS 2063:2008, ASTM F1952-10, EN1078, CPSC 1203Intended Use Gravity Weight960g (+/- 50g)Sizing Size Extra Small Small Medium Large Extra Large XX-Large Head Circumference (cm)53 - 54cm55 - 56cm57 - 58cm59 - 60cm61 - 62cm63 - 64cm Head Circumference (in)20. 75 - 21. 25"21. 25 - 22"22. 5 - 22. 75"23. 25 - 23. 75"24 - 24. 5"24. 75 - 25. 25" | Leatt | Helmet Mtb Gravity 2. 0 Men's | Size Medium In Blue