There are many haircloth interlining that are simply soft, but the most distinctive feature of this haircloth interlining is that not only are the warp and weft thread made of 100% wool , but it is also elastic in the warp direction, so it follows the stretch of the one-sided textile , since it is wool on one side, if you use the wool side on the outer textile side, the wool will intertwine with the textile and fit very well.