Lazer Revolution bicycle helmet With the sturdy Revolution bicycle helmet you can go out with your mountain bike without a care in the world. The comfort of this helmet is optimal due to the good ventilation and the adjustable visor. The fit can be adjusted with the Advanced Turnfit system. It is also possible to place a camera on the helmet with the Safety Mount system. Specifications: Color: black Gender: unisex Outer shell material: plastic Intermediate shell material: polystyrene Inner shell material: mesh Size: S Head circumference: 52-56 cm Ventilation: 23 openings Weight: 425 grams Contents: 1 Bicycle helmet 1 Chinguard