Regular cotton waterproof cover for heating mat size 74″ x 28″. Material is not blocking PEMF, negative ions or infrared rays. Top – 100% cotton / Bottom – medical grade polyester 100% waterproof. About 3 mm thick.
Cover is non-returnable. No warranty after first use. Gentle wash only.
My wife and I both enjoy the softer interface this cover provides. It also keeps our perspiration away from the mat surface which then can be washed.