The kids helmet suitable for many outdoor sports such as skating, skateboard, riding bikes, scooters roller, blading cycling, biking,balance bike ice and roller cycling skating, rolling, ATV, BMX and other extrem sports. S :19.5 - 20.5 inch(48–52 cm) suitable for 3-5-8 years old kids;M : 20.5 - 22.5 inch (52–56 cm) suitable for 8-14 years old Youth.The Helmet is the perfect choice for the protection of your child and toddler’s head. Your child will have the protection meet the standard. As designed with multiple vents, special aerodynamic design and breathable foam, the skate helmets help reduce sweating, adjustable straps can adjust and lock the position of the helmet.kids helmet fit system and additional pads are designed to grow with your child's head.Our goal is keep our kids away from hurt when they enjoy the joy of sports.Perfect Gift ChiceProtective gear for kids ,Great holiday gifts for your boys and girls!It is a good choice as Children's Day gift, Christmas gift, birthday gift and other festival gift.The child will be overjoyed when he/she receive your present!