Ice or heat bag alleviates pain, reduces inflammation, and promotes healing for injuries, sprains, and muscle soreness. Bag is made of durable polyester and pongee fabric. No worrying about messy drips or condensation, ensuring comfort and peace of mind with a leak-proof design. Soft and flexible exterior conforms to your body for a comfortable and gentle application. Wide-mouth opening for easy fill with a screw-on cap. Use with ice cubes, crushed ice, or cold water. For warm therapy, fill with hot liquid at or below 140 degrees F. Holds up to 47oz. of liquid. Keeps warm for up to 30 minutes and cold for up to 1 hour. Hand wash only.