Description Shell: High-quality impact resistance EPS(U.S. material) ABS/PP Shell Liner: Comfortable and breathable, removable and washable. Retention system: Quick release buckle with durable strap. With durable quality of adjustor, WITHOUT visor Size: S(48-54cm/18.9-21.3in) M(54-58cm/21.3-22.8in) L(58-62cm/22.8in-24.4in) . Weight: 300-370g. Dimensions 27 × 23 × 16 cm Size S, M, L