From Flat Socks, the Rainbow Cushioned Liners feature: Odor-control tech helps keep feet fresh Moisture-wicking pulls sweat away Supportive foam makes every step comfy Directions: If possible, remove current insole in shoe and use as a trim guide for Flat Socks. If you can’t remove shoe insole, use trim guides on the back of the Flat Socks to trim to the right size. Fits up to women's size 11 100% polyester Machine wash cold with like colors, no bleach; tumble dry Imported.