The Floriani Water Soluble Topping creates a smooth stitching surface for your machine. When your machine operates around loops and grooves in the fabric, it will impact your stitch quality. The Floriani Water Soluble Topping is entirely water-soluble and delivers outstanding stability on the surface of your fabric by keeping your stitches elevated. Great for use on textured fabric like corduroy, seersucker, velvet, knits, and also lycra/spandex.