Extra Covers for Ultra-Dry Crate and Kennel Pads made with Microfine antimicrobial fibers technology, Constructed with a stay-dry material next to your dog that is porous and non-absorbent allowing fluid to pass through to three middle layers of Microfine moisture dispersion fabric, The bottom layer is a barrier layer that prevents urine from soaking through and protects the orthopedic foam core of the pad, SKU: PCHPD028