The BossUP features a diamond-stitched twill face layer made from 50/50 cotton/polyester that is more durable and wrinkle-resistant than fabric with a plain weave. The gray, non-slip, brushed polyester backing is laminated to the soaker layer to create a pucker-resistant, waterproof barrier which allows this pad to feel smooth and comfortable. A heavyweight soaker layer with high rayon content ensures maximum absorption and combines with the pucker-resistant barrier to ensure better skin intergrity for the user. "The Boss" Choose this underpad because it's an absorption leader with a durable twill face, and it has a non-slip, polyurethane laminate lining. Pucker-free barrier. White Twill Face, 50/50 Cotton/Poly Non-Slip Gray Pucker-Free Barrier 9.5 oz. Soaker, 65% Polyester / 35% Rayon