This is laminated with 1mil pul on Polyester Interlock. 2 way stretchy, 146g/5.1oz per SQM (Square Metre). Great for use iin making AIO cloth diapers, diaper covers, adult diapers, wetbags and pail linters, and any other items which need waterproof fabrics. 55/56" Polyurethane Knit PUL Fabric manufactured by Fabri-Quilt. 100% Waterproof.