Quality material with great versatility. Ice and water keep their cool for hours. Very gentile on the skin. I have used the strap that comes with it to secure it to my back, shoulder, forearm, calves. I have also used floss bands to secure the packs. The small pack is best for forearms or if one side of the back is tighter than the other. The medium band is the best option for almost everything else. I use the large band for whole lower back, scapula winging treatment, and for neck pain.