The Contour Neck Pac was one of the original products developed by Herbal Concepts and is still a top seller. The Contour Neck Pac is specifically designed to fit the contours of the neck. The Pac stays in place while walking, standing or sitting. The Pac contains a blend of twelve soothing herbs and can be used hot or cold to relieve neck and shoulder tension: Lavendar-Nerve Tonic, Valerian Root-Relaxing Anti-Spasm, White Willow-Analgesic, Chamomile-Nerve Tonic, Rosemary-Headache Support, Peppermint-Pain Support and Anti-Spasm, Spearmint-Nerve Support, Hops-Sedative, Yellow Doc-Circulatory Support, Lemon Grass-Analgesic, Cinnamon-Anti Spasm and Yarrow-Healing Support. When heated in a microwave, the Herbal Comfort Pac provides a variety of medical benefits by absorption into the skin and through aromatherapy. Let your sense of smell and touch carry you away to relaxation. For heat therapy warm in microwave for 1-2 minutes, depending on desired warmth. Increase by 30 second increments as needed. (Check temperature to ensure that warmth is ideal before use.) A light misting of the herbal pack will offer a soothing moist heat. Cold therapy can be acheived by putting the herbal pack in a ziplock bag and placing in the freezer for 2 hours. When storing your herbal pack, place in a dry cool place in a ziplock bag to increase its longevity. Doing this will help the aromatic herbs in your pac last for years. Its a great safe non-electric, portable heat source for traveling or at home.