【SMALL/LARGE Size】The SMALL bicycle helmet fits for 55-59 CM / 21.7-23.6inch head circumference, suit for over 5 years old. LARGE helmet fits for 57-61 CM / 22.8-24.4inch head circumference. More choice for your family. 【DETACHABLE LINING】 The inner liner can be removable and cleanable, easy to wash the sweat away. The liner is made of high-density EPS foam cushion layer, soft and comfortable. Suit for 4 season, it is warm, moisture absorption and breathable fabrics. 【BASEBALL CAP SAFE DESIGN】The adult bike helmets Material is ABS + PU leather outer surface, longer brim design keep your head from UV sunshine and rains.It is lightweight make your head feel good during cycling. 【CPC TEST】The cycling helmet have passed the CPC TEST, suit for over 5 years old, if you need the CPC Certificates and the TEST REPORT of the Bicycle Helmet, please feel like to contect us.The helmet suitable for Traveling Cycling, etc 【EASY ADJUSTMENT】Adjustable strip with Quickly Release Button and high quality Chin Protector, maximize the best fit and comfortable wearing. 【GIFT】12 PCs Reflective bike sticker as a gift for you,keep you safer at night: Reflect car’s light to decrease risk at night and rainy days. A bicycle helmet is an essential piece of safety accessory for cyclists. The sturdy outer shell is made from lightweight and durable materials, disperses the force of an impact. With polystyrene foam inner, more shielding your head. With various colors, you can find a helmet that not only keeps you safe but also complements your bike and personal style. When you are with the bicycle helmet, it can provide the peace of mind you need to fully enjoy your cycling.