Reusable hot/cold pack for muscle or joint treatment. Its gel-based compounds provide flexibility at all times to adapt to any part of the body regardless of the degree of temperature. Its use in cold therapy provides anti-inflammatory properties and reduces pain in case of injury or operation. Its application in heat therapy provides soothing relief to tired, sore or injured muscles. Donjoy technology provides long lasting and continuous hours of use for any treatment thanks to the implementation of external compounds in neoprene cells contained with nylon. The protective cover avoids direct contact with the skin to avoid the affection of sensitive areas. The hot/cold pack can be used by men and women according to the recommendations of a specialist.