Streamlined Speed and Underfoot Protection for High-Output Trails

The Darn Tough Bolt Micro Crew Ultra-Lightweight with Cushion is engineered for fastpacking, technical trail running, and hikers looking to shed weight without sacrificing underfoot protection. This specialized sock utilizes a fine-gauge, ultra-lightweight knit of premium Merino wool along the top of the foot and ankle, creating a highly breathable, race-ready profile that vents heat and vapor instantly during high-output summer pushes. The micro crew height sits just above a standard mid-cut shoe collar, keeping trail debris and dirt out.

What sets the Bolt apart is its hybrid construction: it pairs an ultra-thin, low-bulk upper with targeted terry-loop cushioning directly under the foot. This strategic cushion provides critical impact absorption on hard-packed singletrack and rocky descents while maintaining a streamlined fit inside performance footwear. Built with an active performance fit, it hugs the arch and heel perfectly to eliminate slipping, bunching, and the friction that causes blisters. Made in Vermont, USA, this durable trail sock is backed by Darn Tough's iconic unconditional lifetime guarantee.

Key Features:

• Ultra-Lightweight Upper Knit: Minimizes weight and bulk across the top of the foot to maximize ventilation and accelerate drying times.
• Targeted Underfoot Cushioning: Strategic terry loops under the sole provide plush impact protection where you need it most without filling out your shoe.
• Premium Merino Wool Blend: Pulls sweat away from the skin and regulates temperature to keep feet cool on hot days and dry during sudden downpours.
• Blister-Free Performance Fit: A secure, supportive architectural knit prevents the sock from shifting, sliding, or bunching inside technical trail shoes.
• True Seamless™ Toe: Features an ultra-flat, undetectable toe seam that completely eliminates chafing, hot spots, and pressure points.
• Natural Odor Control: Inherent antimicrobial properties within the wool fibers combat odor-causing bacteria for multi-day freshness on thru-hikes.
• Guaranteed For Life: Meticulously constructed for long-term endurance and backed by Darn Tough's legendary, unconditional replacement policy.