These therapeutic boots can be used hot or cold to treat injury and speed up recovery after strenuous exercise, minimize swelling and inflammation, relieve pain, relax tight muscles, encourage blood flow to speed up healing and help with arthritic conditions. Gel packs can be heated in hot water or the microwave or cooled in water or the freezer. The boot is ergonomically designed for comfort and specifically shaped to be used on joints as flexible neoprene and cut outs allow movement. Suitable for use on the knees, elbows or fetlocks.Inner pockets keep gel packs secure. Sold in Pairs. Cool wash, do not tumble dry.