Darn Tough T4050 Extreme Cold Weather OTC Tactical Boot Socks – Full Cushion | Maximum Warmth for Harsh Conditions

Built for the cold. Proven in the field.

The Darn Tough T4050 Extreme Cold Weather Over-the-Calf Tactical Boot Sock is the ultimate heavyweight performer in freezing conditions. Designed for military operations, mountaineering, and extreme cold deployments, this full-cushion sock keeps your feet warm, dry, and ready for action no matter how low the temperature drops.

Constructed from premium Merino wool, these socks trap heat while wicking moisture away from your skin. Reinforced heels and toes deliver long-term durability, while full terry loop cushioning from toe to cuff provides unmatched comfort and insulation. Berry Amendment Compliant, USAF Safe to Fly Certified, and NAVAIR SOA Approved, the T4050 meets the most demanding military and tactical standards without sacrificing comfort or performance.

Why We Love It

Because it’s more than a cold weather sock... it’s cold weather armor. The T4050 is built to survive the mission and the mountain, delivering warmth, breathability, and reliability when nothing else will.

Ideal For

• Military Combat Boots

• Tactical Boots

• OCP Uniforms

• Mountaineering

• Extreme Cold Weather Deployments

Key Features of the Darn Tough T4050 Extreme Cold Weather OTC Tactical Boot Sock

• Over-the-Calf height covers leg to just below the knee

• Full Cushion provides maximum warmth and protection

• Heavyweight construction insulates and cushions in freezing environments

• Performance Fit prevents slipping, bunching, and blisters

• Fine-Gauge Merino Wool keeps feet warm, dry, and odor-free

• Berry Amendment Compliant and 100% Made in the USA

• USAF Safe to Fly Certified and NAVAIR SOA Approved

• Reinforced Heel and Toe enhance durability under pressure

• True Seamless construction eliminates friction for all-day comfort

• Lifetime Guarantee – if they’re not the longest-lasting socks you’ve ever owned, Darn Tough will replace them

Specs

• Height: Over-the-Calf

• Weight: Heavyweight

• Cushion: Full Cushion

• Fabric: 79% Merino Wool / 20% Nylon / 1% Lycra Spandex

• Style Number: T4050

• Pair With: Military combat boots, tactical boots, and OCP footwear

Sock Care

Machine wash cold on gentle cycle, inside out. Tumble dry low or hang dry. Do not bleach or dry clean.

Size + Fit: