SUPER LIGHTWEIGHT - Only 0.4-0.45lb helmet weight. Sturdy polycarbonate outer shell & EPS inner but no burden. | FOR MULTI SPORT - Suitable for skate, bicycle, scooter, skateboard, etc. Best gifts for children. | ADJUSTABLE SIZE - XS size for kids' head circumference 18.8-19.7 inch (about 2-3 years old), S size for kids' head circumference 20-22 inch (about 4-10 years old) | COMFORTABLE & BREATHABLE - A soft little pad to cushion chin. 17 air vents keep cool. | All-round SAFETY PROTECTION - Passing US safety standards. Come with the whole protective gear set including knee pads, elbow pads and wrist guards.