By adopting sturdy PC material on the outside and thickened high density EPS soft material on the inside, this bicycle safety helmet has an ability to disperse the shock and external force, and absorb impact energy, providing your head with comprehensive protection. Unlike other traditional bike helmet, this product is an adjustable bike helmet to conform the head circumference perfectly, keeping the bike helmet stay in place and better protect your head fully. It is made of high-quality PVC and EPS material. Designed with multiple ventilation holes and super light, this bike safety helmet brings you an ultimate comfortable wearing feeling. The length of this product is 28cm, width is 21cm and height is 15cm. The head circumference is 58-61cm. This product is perfectly suitable for outdoor, bike, cycle, bicycle, MTB, etc. Item Name: Bicycle Helmet Material: PVC, EPS Features: Super Light, Practical, Breathable, High Durability Size Details: Size: 28cm x 21cm x 15cm/11.02" x 8.27" x 5.91" (Approx.) Head Circumference: 58cm-61cm/22.83"-24.02" (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