1Lightweight And Durable: Cycling helmet with EPS foam body and PC shell, one piece connection design, lightweight and stable, strong and durable. 2Breathable: The bike helmet has up to 21 vents to enhance air flow, ventilation and heat dissipation system to keep your head dry and breathable. 3Adjustable: This bicycle helmet has a head circumference adjustment system, the size is adjustable at will, suitable for 61 to 65cm head circumference. 4Safe Protection: Adult cycling helmet has a beautiful appearance, with strong impact absorption capacity, can guard your head from direct impact. 5Wearing Scenario: This cycling helmet is suitable for most men and women, even in the summer, suitable for road cycling, city commuting, etc. Specification Item Type: Cycling Helmet Material: PC, EPS Head Circumference: Approx. 61-65cm / 24-25.6in Number of Holes: 21 Package List 1 x Cycling Helmet 1 x Instruction Manual