The resistance band is made of polyester-cotton and rubber latex thread with reinforced edges, which not only enhances elasticity but also reduces the risk of edge inversion during use. A non slip inner strip has been added, so the hip strap remains in place. There are three different tension values that are suitable for different stages of exercise. When you progress from beginner to professional level, switch the resistance from mild to intermediate to strong, helping you accelerate your exercise game. 29 9/10'' Per x 3 1/10'' W