Helmet shell made of high temperature plastic High strength, light weight, high strength and corrosion resistance. The inner lining is ultra-light EPU for better shock resistance, soft and comfortable to reduce head damage and the soft hook and loop impact absorbing lining can minimize head damage. Adjustable chin strap with quick release for better adjustment and fit around your head, easy to place or remove Protector design provides excellent radiant power, heat dissipation, breathability, suitable for children and adults in outdoor sports For example: rock climbing, mountaineering, snowboarding, downhill, caving, skating, motorcycle, BMX, scooter, cycling, caving, downhill, skateboarding, inline skating, roller skating, fitness, construction, etc. Cycling Glasses: Cycling Glasses Goggles Desert Dust-Anti-Reflector Cycling Glasses Sports Glasses Built-in Foam Glass Material: EPU Head size: about 56-62 cm