Recommended Age Size S is suitable for children aged 3-8, and the recommended weight is 33-55 lbs (15-25 kg); size M is suitable for children aged 7-13, weight 55-99 lbs ( 25-35 kg). Adjustable Velcro straps ensure free movement during exercise, allowing your child to enjoy the exercise experience freely. Durable & Comfortable Consist of anti-scratch high-hardness PVC shell for hard protection, and soft sponge material for impact buffering, yet comfortable in wearing. Protective Gear Set Includes 2 knee pads, 2 elbow pads, 2 wrist pads and 1 collecting handbag. While it prevents the loss of the protective gear suit, it is convenient to carry. Safety & Fun Designed for children's sports safety protection, especially suitable for bicycle, roller skating, skateboarding, skating and other sports, it is also a perfect gift for children on Christmas, Thanksgiving, Birthday and Children's Day. Warranty Back by an 1-year warranty of replacement of refund. If you are not satisfied with our protective gear set, please contact us in time, we will respond within 24 hours.