KEDLEY Hot/Cold Gel Pack Compress for natural pain relief without medications. Cool in the fridge or freezer to reduce swelling or relieve inflammation. Heat in the microwave to ease aches and pains associated with joint issues and muscle stiffness. The product includes a reusable non-toxic gel pack along with a protective positioning pouch for easy application. Packs are designed to retain temperature for between 30 minutes to 2 hours depending on the application. For full instructions and precautions please refer to the insert inside the box.