The Gel is the doctor-designed, drug-free way to relieve pain and inflammation. Gel bead packs use innovative technology that absorbs and delivers heat & cold for the doctor recommended 20 minutes of highly effective therapy. Their dual action provides twice the therapeutic benefit in a single pack: start with ice to reduce swelling and bruising, then switch to heat for penetrating pain relief. Whether chilled or heated, gel bead conveniently holds its temperature for the doctor recommended.