Cryosphere Hot / Cold Foot Massager Textured shape allows you to apply various amounts of pressure to reduce tightness and soreness throughout the arch and heel. For hot / cold therapy, place it under warm water or in the freezer until desired temperature is achieved. Portable and simple to use, providing an easy way to get foot pain relief. This unique massager provides much-needed relief to those with plantar fasciitis, heel spurs and aching feet. Made in USA.