Polyester ( 100 %) , Spandex ( 12 %) , Polyester ( 88 %) Designed to deliver a moist heat treatment Treats shoulders, lower back, and abdomen Just microwave and apply Non-toxic and odor free" Thermalon Microwave Activated Moist Heat Pad for Shoulder, Abdomen, Back, Hip, 9" x 12"! (C🔴)