Material: Silicone Size: 3 layers: thickness 2cm 2 layers: thickness of 1.5cm 1 layer: thickness 1cm L: 11.2x6.5cm S: 9.5x5.5cm [ Correction and Protection ] - - Adjustable Heel Wedge Inserts can save you from knees pain and deformed foot caused by an incorrect walking posture. This heel inserts is design for bow legs, knee pain, foot alignment, osteoarthritis, knock knees, bowlegged-ness, pronation, posture problems, and other issues caused by uneven foot alignment. [ Heel Cup Support ] - - 3 or 2 or 1 Layers Adjustable Heel Wedge Corrective Inserts has been modified and optimized with a heel cup design that snugly wraps around your heel, helping to stabilize your heel and maintain postural stability. [ Adjustable Gradient ] - - Orthopedic supination and pronation correctiive heel wegdes insoles layers can be used individually or as a combination. The top layer is 0.45", and the other thinner layers are 0.2". The gradient difference corrects the strength of the internal rotators, changes the way of walking with force, thus improving your body, legs, and walking posture. [ Change Walking Posture ] - - The height difference corrects the strength of the internal rotator muscles, changes the way of walking with force, and allows the muscles that are not commonly used to start training and exerting force, thus improving the body, legs and walking ability. [ EASY TO USE ] - - They are enough side to support your heel and your weight, will not move around down to mid foot. Wear medially to correct over-pronation counteracting knock knees and ankle eversion. Wear laterally to correct supination, preventing bow-leggedness and ankle inversion sprains. Suitable for almost shoes, sandals, boots, leather shoes, flats, sneakers etc.