100% all natural aromatherapy. Herbal Packs Heat & Cold Mittens are filled with 12 healing herbs and the highest quality Linseed available. The natural herbs help relieve stress, tension, cramps and muscle discomfort. Using Herbal Pack's Heat & Cold Mittens promote fast relief from joint and tendon pain. One size fits all. Microwave for instant heat therapy, chill for cold therapy. Hot or cold Herbal Pack's Heat & Cold Mittens can help you relax, rejuvenate and restore your body and soul.