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.
This has just enough "cushion" to make it comfortable to sleep on, but does not hinder the effect of the mat.rn
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.