Product Information Features：Shock absorption,Lightweight,Comfortable and breathable,Two-sided logo Specification: 1.[Product Name]Utralight Integrally-molded Helmet 2.[Material]PC Shell+High Density EPS 3.[Color]Black,White 4.[Weight]About 243g 5.[Size]About 21cm*28cm*14cm 6.[Circumference]54-62cm 7.[Gender]Unisex Style 8.[Applicable To]Road Bike/MTB/Electric Bike Package included: 1 bike helmet NOTED:The applicable head circumference of this helmet is 54-62cm. Please confirm whether your size is suitable before purchasing.