For either hot or cold therapy. Ideal for treatment of minor injuries such as scrapes, bruises, sprains, strains and chronic aches and pains. Reusable hot/cold compresses consist of one hot/cold gel pack with a universal wrap cover. Wraps are made of a soft foam material that is hook compatible and has a soft, absorbent terry cloth. Smaller size (4 x 15") is ideal for the neck, leg and ankle. Larger size (6 x 10") is ideal for the back, shoulders and thighs. Replacement gel packs can be purchased separately in packs of four.