Reusable & Washable Potty Training Pads for Puppy Playpens. Midlee’s pee pads use durable and plush fabric with outstanding absorbent and breathable properties to soak up urine in a matter of seconds. Many uses: puppy potty training pads, inside a pool for a whelping pen, the aging dog with incontinence and more! Made to maximize absorption and minimize messes. The quilted top layer, 2-layer absorbent core and waterproof bottom layer. Once soiled, wash, dry, and reuse.