This re-designed Herbal Comfort Pac made from extra soft Minky has an envelope style fold to hold the herb pac in place. The pac provides 100% all natural aromatherapy. Each pac has a removable inner pac filled with 12 healing herbs and the highest quality, natural grains available. Just remove the inner herb pac and the outer wrap can be washed using cold water and mild soap on a gentle wash cycle. Do not submerge herb pac. The Herbal Comfort Pac is designed for luxury, comfort and use in multiple areas. The natural herbal content contours to the curves of your body and helps to relieve stress, tension, cramps and muscle discomfort. Microwave for instant hot therapy or chill for instant cold therapy.