Wholesale Polyester Interlock - Black. 100% Polyester. 60" wide. Machine washable.Polyester Interlock is a 70 denier light weight 2 way mechanical stretch polyester knit. It is traditionally used for lining dresses. Additionally, it is great for wall treatments, decorations, swaging, and more! This knit interlock fabric is It is machine washable and Soft to the touch making it a versatile across various projects. It is also largely opaque and 100% polyester, making it perfect for printing and dye sublimation.