This is a reusable cold pack meant to reduce pain and swelling. It is ideal for sprains and strains that may occur at your ankles, wrists, elbows, knees, and more. There are 2 sides to this Universal Pad: a soft blue side and a smooth white side. The blue side is for gentler cold therapy, while the white side provides maximum strength cold therapy. And, unlike other cold packs, this pack stays flexible when frozen which will let you easily conform the pack around whatever area you need it in. And for added convenience, this pack comes with an adjustable strap to keep the custom fitting cold pack in place.