Gel Heel Cushion Silicone dual layer construction of these heel cups with its shock absorbing properties provides amazing support and comfort to your feet all day long. These heel cups are hypoallergenic, non-toxic, non-flammable and odor free. The dual density soft gel silicone absorbs shock on heel impact and provides even pressure distribution providing relief from heel pain as well as ankle pain, knee pain and back pain. Properties: Non-compressible dual density medical grade silicone, Two levels of silicones; soft and firm, blueRed area is extra soft for greater cushioning of sensitive areas, Washable and transferable between footwear, Hypoallergenic, non-toxic, non-flammable and odor free. Indications for use: Heel pain, Plantar fasciitis, Heel spur, Knee and back pain, Ankle pain. Very useful for any prolonged standing or walking activity. A must have for sporting activities, especially where impact shock reduction is required.