This sauna blanket features PU fabric that resists water, with multi-strand heating wires for warmth and full-body heat retention. The arm opening design frees your hands, so you can enjoy a home spa while watching your favorite shows and relaxing. | Vevor | | Infrared Sauna Blanket with Armholes, 71 x 35 in Portable Sauna Bag, Even Heating for Home Detox & Relaxation | Black | Best Buy