Uniquely designed to give complete treatment to all the shoulder muscles of the upper arm, upper chest, and upper back. It's totally flexible, allowing mobility during treatment: great for any sport utilizing the rotator cuff, pecs, or deltoids, especially baseball pitchers. Heat helps to restore flexibility and provides excellent therapy for minor injuries during and after rehabilitation exercises. *NOTE: Some people have asked to return this item because they say is does not get cold like the direct application of ice. That is true, as there is a layer of Lycra between the coolant and your skin. Plus because most household freezers are actually too cold for direct applications this safeguards you against over cooling the treatment area.