The outer shell is made of high-quality PE material, which can effectively resist strong impact. The inner side is designed with a cotton pad to cushion the impact which can effectively protect your joints. Designed with elastic straps for easy adjustment of tightness,Soft-vented bio-foam chassis keeps you cool and comfortable. This protective gear is scientifically designed with ergonomic principles and is comfortable to wear! The joint can be bent without affecting normal activities. It is a good joint protection for many outdoor sports. The ergonomic principle is scientifically designed and the body is comfortable! Joints can not affect normal activities when bending, and are a good joint protection for many outdoor sports. Scope of application: motorcycle riding, electric bicycle riding, bicycle riding and other outdoor sports.