When heated in a microwave, Herbal-Ease® Aromatherapy Uni-Pack releases moist heat to help soothe and relax tense muscles. The specially formulated herbal blend is fragrantly aromatic and helps relieve joint pain, aches and muscle tension. Made with highly durable fabrics and quality workmanship, the Uni-Pack may be used for hot or cold therapy. Its versatile shape (10” x 15”) makes it easy to apply to any part of the body.