Specifications: With adjuster knob, head circumference can be adjusted. Built-in waterproof EPS lining, it has strong impact resistance, soft and comfortable to wear. There are 12 ventilation holes on the top of the head to prevent water accumulation. Lightweight helmet is easier to carry, and less pressure on the neck and head. Ear protection design has large leak holes to prevent water from entering the ears. With adjustable chin rest and button design, it is safe and not easy to drop. Item Name: Helmet Material: ABS, EPS, PC Gender: Unisex Features: Durable, Waterproof, Adjustable, Gift Size: M: Suitable for Head Girth: 56cm-58cm/22.05"-22.83" (Approx.) L: Suitable for Head Girth: 58cm-60cm/22.83"-23.62" (Approx.) XL: Suitable for Head Girth: 60cm-62cm/23.62"-24.41" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Helmet