Designed to be worn in sub-zero weather and for all terrains.

Fiber Contents: 60% Worsted wool, 27% Exclusive THOR•LON® Acrylic, 11% Stretch nylon, 2% Spandex

1 - Exclusive Wool/THOR•LON® Blend for maximum warmth and wicking.

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

3 - Moderate cushioning at ankle, shin and instep to protect against boot pressure/in arch for better fit (spandex added for support).

4 - 100% worsted wool toe for maximum warmth.

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