Keep your bedding dry so you don't have to launder your sheets as frequently. The Disposable underpads (sometimes referred to as Chux) are for a one-time use only and can be used until they have been soiled and then they are discarded. Disposable waterproof pads are for sale by the bag or the case. The Reusable Waterproof bed pads are made of a quilted cloth top-layer with an absorbent core and a full waterproof vinyl backing. The cloth bed pads are machine washable and dryable and can be re-used as often as needed. Both include a waterproof backing; however, the cloth underpads will typically provide your maximum absorbency, available with a 7 oz or 11 oz. soaker. You can also use both, a disposable bed pad on top of the reusable bed pad, so if there is light soiling, you may only need to change the disposable pad, but heavier voids will be captured by the reusable underpad underneath.