Elastic and Adjustable straps on waist and tights. Size S: Waist circum 55-80cm(21-31inch), tight circum 30-40cm(11-15inch); Size M: Waist circum 65-95cm(25-37inch), tight circum 35-50cm(13-19inch) Impact Resistant Padding: 2cm thick EVA padding provides overall protection for your lumbar, butt, crotch and thigh. It helps to guard the hip and tailbones of our children against shattered when falls down or slids down. Breathable Material: The lycra fabric lining is lightweight and soft to wear inside or outside pants. Anti-slip hollow design increases surface friction to provide more fun while playing without restricting your kids movement. A Ideal Gift for Your Kids - A wonderful gift for your kids who like sports, such as skiing, snowboarding, ice skating, figure skating, roller skating, skateboard, scooter, hockey, most indoor and outdoor sports.