Take The Pain Out Of Injury Relief! SmartTemp® Dual Action Hot & Cold Injury Relief is an effective, convenient solution to injury aches and pains. It helps to relieve injury pain by providing both hot and cold therapy at the same time. The gel pack can be easily heated or cooled in a microwave or freezer. The heat increases the blood flow to the injury to promote healing and the cold reduces inflammation and helps to ease the pain. Effective Injury Relief • Portable and Reusable • Provides both hot and cold therapy at the same time • Designed for knees, elbows, shoulders, and ankles • Integrated Velcro strap keeps your hands free and keeps delivering relief in the right place • Areas that need heat therapy will receive heat, and areas that need cold therapy will receive cold Convenient Injury Relief • Red heat therapy gel pack can be heated in the microwave. Blue cold therapy pack can be cooled in the freezer • Compact but effective design makes storage a breeze. It"s only 9" by 13"