ADJUSTABLE SIZE : FABSPORTS Kids bike helmet comes with a dual fit adjustable design, there is a adjusting knob at the back of the bike helmet that helps to adjust the head circumference (size: 20.47-22.04 inch/(52- 56cm)) and it also has side strap to make the helmet fit most kids of the age 5-6-7-8-9-10-11-12 years HIGH RESISTANT MATERIAL : Special material impact resistance: This Bicycle / bike helmet uses high-density, durable and tough pvc and eps foam. The Integrated molding with superior technology is helpful to decrease the impact force and protects the rider's head during crash MULTIPLE SPORTS USE : This helmet can be used for multiple sports like for Road cycling, Mountain Biking, Skating, for Skate Boarding and many other uses. SUPERIOR VENTILATION: The integrated flow vents help to keep cyclists cool and it is also helpful to increase the speed. The inner sponge lining can be removed to wash. REMOVABLE INNER LINING - The inner lining is detachable and is also washable. Not only it protects your head but also keeps it hygienic as you can wash the same.