Snapbac Hot/Cold Therapy Pod Each Therapy Pod Pack works for both Hot and Cold Microgrips fuse with garment or sleeve mesh layer to stay in place 5 sizes available for targeted relief: Small for elbows, knees, calves and shins. Medium for most muscle groups. Large for back, hips and quads Can be heated in the microwave or frozen and always stays flexible Slim design allows recovery without inhibiting movement or activity