Designed for: Extended trekking/backpacking, in all climates, on all terrains

Fiber Contents: 44% Exclusive THOR•LON® Acrylic, 39% Wool/THOR•LON®, 8% Stretch nylon, 6% Insulating hollow-core polyester, 3% Spandex

1 - Exclusive Wool/THOR•LON® blended with thermal fibers for maximum insulation and wicking.

2 - Extra thick cushioning cushioning in ball/heel for reducing shock, impact, shear and blisters.

3 - Moderate cushioning - at instep for protection against boot pressure/in arch for better fit ... spandex added for support.

4 - Ventilation panel for better wicking.

30 Day Money Back Guarantee
30 Day No Risk Trial. Thorlos feel better than your "ordinary socks" or your money back! Proper shoe fit required.  Send the Thorlo socks directly to Thorlo Inc. for a refund.   Include your dated sales receipt and return address for quick response.

Quatro Boot Size     Sock Size     USA Men's Shoe Size

5-7                                 M                          5.5-8.5

8-11                               L                           9-12.5

12-15                             XL                        13-15