The dual layer construction of these heel cups with its shock absorbing properties provides amazing support and comfort to your feet all day long. Made with 100% medical grade silicone gel, these heel cups are hypoallergenic, non-toxic, non-flammable and odor free. Temperature control properties ensure that these heel cups will not get warmer than your body temperatureThe 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. Indications for use: Heel pain Plantar fasciitis Heel spur Knee and back pain Ankle pain