Like Patrice, I bought the light weight interfacing and cut it into strips. However, I bought 3 yards and cut it in 108" strips. Since I mostly make oversize queen quilts using queen batting, I wanted my strips long enough to be able to use just one strip to add to the side of my batting. I have used this on both poly and cotton/poly batting. I just had to reduce the heat and be extra careful with the poly batting. Once the quilts are quilted and bound, I can't tell where the splices are.