It is comfortable for you to wear this bicycle helmet with many ventilative holes because it is ultralight, breathable and adjustable. This integrally-molded, shock absorbing and impact resistant bicycle helmet can provide your head with protection from injury. 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. The lining is detachable and it is easy to clean. 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