"Keep feet warm for the long haul with the Hollow Boot Socks! Premium blend of soft baby Peruvian alpaca fibers delivers 3 times more warmth than wool, wicks away moisture, naturally resists odors, and keeps feet comfortable in temperatures swinging from -20F to 50F. Approximately 14"" from cuffs to heels. Medium fits men's shoe sizes 6-9 and women's sizes 79.5. Large fits men's shoe sizes 9.512 and women's sizes 1013. XL fits men's shoes sizes 12.515. 70% baby alpaca fibers/27% nylon/3% spandex. Machine wash. Imported.Manufacturer style #: HOLLOW-BOOT-GRE. 70% baby alpaca fibers/27% nylon/3% spandex 3 times warmer than wool Soft and moisture-wicking Naturally resists odors Keeps feet comfortable in temperatures swinging from -20F to 50F"