Priva Ultra Plus - Absorbent Waterproof Reusable Bed Pads are oversized polyester-rayon filled quilted absorbent underpads with 4 layers of protection. A 50% cotton/50% polyester surface with a 100% waterproof vinyl nonslip backing. And, the quilted design retains a flat, smooth profile without pleating or bunching. Rounded corners add life to to the pad, by preventing corner abrasion. Priva Ultra Plus is an incontinence product rated at 4 fluid cups on the Priva absorbency scale.