These premium reusable 18"x24" underpads are made with four layers of material that absorb liquid and lock in moisture, keeping your sheets dry all night. The top layer is a soft, quilted polycotton fabric, followed by a polyester fiberfill layer, an absorbent inner layer, and a non-slip latex-free waterproof barrier. These underpads are machine washable and dryable on normal settings, and you can even use mild bleach on them.