Extreme Alpaca Slipper Socks Size 9-11 (Fit Men's Shoe Size 7-9 or Ladies' 8-10) 74% alpaca/24% nylon/2%elastic This is the original Extreme Alpaca tm Sock! Produced entirely in North America of North American Alpaca Fiber! Alpaca's natural wicking ability will keep feet warm & dry Now with reinforced heel and toe! These run a little small! This size sock fits ladie's shoe size 8-10 or men's shoe size 7-9