The Pressure Relief Insole was designed by a team of doctors and pedorthists to improve balance and body alignment. The PlastazoteA(R) top cover is designed to mold your feet for a custom fit, the extra deep heel cup also helps cushion the foot naturally, and the air flow channels are designed to move warm air out, and draw cool air in. With its PoronA(R) foot strike pads this insole provides maximum shock absorption from heel to forefoot, and the metatarsal support pad helps prevent, and provide relief from Plantar Fasciitis, Morton&';s Neuroma, and Metatarsalgia. Fits most athletic, casual, dress, and hiking shoes which come with removable footbeds.