Bare Knits Interlock is a double knit fabric. It is the creme de la creme of knit fabrics. We start with the very highest quality yarn. Our Interlock is constructed with ring-spun, combed cotton/polyester (or cotton) yarn knitted on double knit machines with 28 stitches per inch on each side. Siltex Interlock weighs around 10 ounces per linear yard.