MaterialPlastic, shoes not included, only shoulder straps. Laces are used to secure loose heels. Adjust The SizeBecause it has good flexibility, so it can play a very effective effect to prevent the misalignment of the shoes, and it is suitable for any size of shoes. Elastic and SoftStretch material fits all sizes of shoes and ankles. The transparent laces can be adjusted according to your requirements. Easy to UseJust slip through the high top from the front to maintain grip with your foot. Nonslip, good stability, great for shoes that dont fit well, and make you feel comfortable. Repeatedly UseDont worry about the heel part slipping.Washable and reusable. That firmly stay in place for lasting comfort.