Hot and Cold belly bag is filled with Clay beads which can be heated up in a microwave for a warm therapy or freezed for a cold therapy. Comes with skin friendly soft cover. Perfect for back pain, muscle pain, neck and shoulder pains. Use warm to soothe stressed muscles and cold to refresh your body. Can be used for both hot and cold therapy Weighted for added comfort and support Soft, breathable fabric Machine-washable cover Reusable Sealy Aromatheray Heating Pad for Cramp and Muscle Relief, Hot or Cold, Clay Bead Filling, Relieves Pain & Relaxes Muscles