Rectangular Shape Gel Filled Pack with Plush Backing Elastic Strap. Pack Can be Used as Hot or Cold Compress is Ideal for Large Area Sports Injuries. for Hand Warmer Hot Pack, Simply Place in Microwave Container with Water for 30 Seconds Until Reaching Required Thermometer. for Use as Cold Pack, Place in Freezer for Hours. Instructions Included. PVC. Minimum Quantity: 50.