"The Hollow Alpaca Hunt Crew Socks for Men help ensure you can cover serious ground in total comfort. Hollow's premium blend of soft Peruvian alpaca fibers wicks away moisture and provides 3 times the warmth of wool in temperatures from 30F to 70F for up to 12 hours. Plus, breathable mesh on the tops of the feet allow air to circulate. Extended Achilles padding and plush 3"" x 1"" ribbed arch support provide extra comfort and support for extended hunts. 49% alpaca fibers/48% stretch nylon/3% elastane. 15""L from cuffs to heels. Machine wash. Men's Sizes M (6-9) L (9.5-12), XL (12.5-15).Manufacturer style #: HOLLOW-HUNT. 49% alpaca fibers/48% stretch nylon/3% elastane Moisture-wicking and odor-fighting 3 times the warmth of wool Great for 12-hour sits in temperatures 30F to 70F Breathable mesh on the tops of the feet Extended Achilles padding Plush 3x1 ribbed arch support All-day comfort"