The Sweater Stone is a convenient tool to remove pilling and renew the finish of sweaters naturally. Created to restore the look of knits and sweaters without exposing them to the rigors of dry cleaning, the Sweater Stone is made of a natural pumice, it quickly lifts away pilling and revitalizes knitted garments. It's versatility allows use on a wide range of fabrics , including furniture and polar fleece. Will last up to ten years under normal use.