Our Extreme Cold Weather/Mountaineering boot sock designed for extreme cold climates or rugged terrain. This is our warmest sock, featuring full terry loop cushioning throughout for maximum warmth. Elastic support at arch. Reinforced heel and toe for increased durability. USAF Safe to Fly Certified and NAVAIR SOA Approved.
Heavyweight with Full Cushion – High density cushioning throughout the entire sock for full on comfort and performance. The most comfortable and warm option Darn Tough offers. True Seamless technology allows for an undetectable seam fusion for an Ultra-smooth, invisible feel.
Boot Sock Height – Sits mid-calf for added protection and warmth. A sturdy companion.
Composition – Knit with 80% Merino Wool 19% Nylon 1% Lycra Spandex. The fast action wicking pulls moisture away from skin, so no more sweaty, stinky socks. The soft, breathable merino wool has fast drying, all weather performance that keeps you cool in the summer and warm in the winter.
Guaranteed for Life – Darn Tough’s famous guarantee – if these socks wear, tear, or develop holes, Darn Tough will replace them no questions asked. No strings. No conditions.
Made in the USA – Every pair of socks is knit in Northfield, Vermont – the perfect testing ground for the finest premium all weather performance socks.