Features the same gel construction and fabric covering as the Elasto-Gel(tm) Hot/Cold Packs, sold left. Contoured design provides complete treatment to all the shoulder muscles of the upper arm, upper chest and upper back. Provides constant pressure to relieve sore muscles. Place in a microwave or conventional oven for heat therapy or in a freezer for cold therapy. Retains heat or cold for 20 to 40 minutes. Guaranteed for six months.