Cryo bands are anatomically shaped braces that contain a safe gel that can be heated or cooled. For cold treatment, place the brace in the freezer for two hours. For heat treatment, place the brace in the microwave for two minutes at 600 watts. The brace can be used under a compression cuff so you can do a massage while the body part in question is being cooled or heated. Ideal for injury treatment! The braces are very durable and easy to use.