1.Adjustable layer system so that you can adjust the thickness to your desired height increase 2.Self-adhesive and immovable don"t fall off easy 3.Reduces knees and back pressure when walking 4.Enhance blood circulation, reduce muscular aches and pains, shock-absorbing after use it 5.Designed to fit shoes of all sizes, fit any kinds of shoes for women and man 6.Can be washed with hand and dry in the air. (Washing method: warm water, gentle hand, natural dry, reusable, long-term use will not be flat deformation.) 7. Each box comes with a free WSWS shoe cleaning Cloth 8.This item has UPC 0628586526105