Hunter Cable Knit Welly Socks in Black are available at Robert Frost Fine Footwear and www.frostshoes.com. A cozy boot sock made out of supersoft polar tec fleece adds warmth, comfort, and style to your favorite Hunter Welly Boot. Welly Socks are made of polyester and are machine washable. Hunter Cable Knit Black Welly socks are sized as follows: M = shoe size 5-7, L = shoe size 8-10.