This bicycle helmet with many ventilative holes is ultralight, breathable and adjustable, which is comfortable for you to wear. Your head can be well protected from injury with this bicycle helmet because it is integrally-molded, shock absorbing and impact resistant. Made of PC and EPS, this bicycle helmet is hard, durable and shock-proof. The length of this bicycle helmet is 28cm, width is 25cm and height is 16cm. This bicycle helmet is suitable for riding, cycling, skateboarding and so on. Item Name: Bicycle Helmet Material: PC, EPS Size: One Size Head Circumference: 58-61cm Battery: Button Battery Features: Ultralight, Protective, Adjustable Size Details: 28cm x 25cm x 16cm/11.02" x 9.84" x 6.3" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bicycle Helmet