Helmet size L, adjustable circumference from 58cm to 62cm This helmet features a lightweight construction, abundant ventilation, comfort during wear, and reduced resistance, making it unique and perfect for cycling, rollerblading, and skateboarding! Provides an integrated shell of engineering plastic and an inner layer of expanded polystyrene for exceptional protection, with an adjustment dial, Y-shaped adjustable strap, and breathable soft chin guard — the helmet stays securely on your head. Features: Impact resistant 18 vents keep your head cool and reduce wind resistance Dial adjustment Super lightweight, weighs approximately 200 grams