●Suitable head circumference: S 19.7 - 21.3 inches (50 - 54 cm); Recommended for ages 8 and M: 21.7 - 22.8 inches (55 - 58 cm); Recommended for teenagers and women with small heads; Large 23.2 - 24.0 inches (59 - 61 cm); Recommended for unisex adults and individual head circumferences may vary ●Helmet size is adjustable. Dial size adjustment Removable ear pads Equipped with goggle stopper ●The helmet is made of ABS high strength plastic and the inner shell is made of EPS anti-shock foam. Lightweight in-mold with outstanding shock resistance ●The lining is made of soft velvet, and the same velvet earmuffs, ensuring comfort and warmth when wearing a helmet ●Lining: Absorbs sweat and moisture and dries quickly / Quick drying / Removable / Washable