J.B. Field's - Icelandic "30 Below XLR" Merino Wool Thermal Sock Size:Large Integrated optical fiber and two

Integrated optical fiber and two high-powered LEDs provide full-length illumination

and safely

Made from recycled PET for sustainability

Easily dressed up or down

J.B. Field's - Icelandic "30 Below XLR" Merino Wool Thermal Sock Size:Large Integrated optical fiber and twoThe J. B. Field's "30 Below XLR" sock is ideal for those who spend a lot of time outside in cold weather and is perfect for winter sports. With a full, heavyweight cushion and soft merino wool, they are sure to keep your feet warm and comfortable in the most extreme conditions. The only differences between these socks and the "30 Below Classic" are the double cuff to help socks stay up better and both ankle and arch support, which prevents slippage