Designed to deliver a moist heat treatment when lying in bed or sitting in a chair. * Washable and reusable * 9" X 12" * MediBeads are washable, odor-free, dust free, and will not support bacteria or fungal growth. * Unlike other grain and pellet products, MediBeads need no special covers, they will not dry out, dissolve or disintegrate. * When microwaved, MediBeads draw moisture from the air and release it as clean, deeply-penetrating moist heat - no need to add water.