You can use the Perfect Fit socks as a boot liner, a regular sock or as slippers.

These super stretchy fleece socks have a snug and comfy fit and three different uses. You can use the Perfect Fit socks as a boot liner, regular socks or slippers. Just roll the top of the sock to the desired length. Made with 96% polyester fleece and 4% Spandex, they are machine washable, warm and fit comfortably. The grippers on the bottom of the socks allow you to walk around without sliding.

Available in 2 sizes for a great fit. 
SMALL- fits women's shoe sizes 5-8. 
MEDIUM - fits women's shoe sizes 9-13.