The Darn Tough RFL OTC Ultra-Lightweight Socks focuses on the important stuff: durability, breathable warmth, and ultra-lightweight fit.

Product details 

• Women's over the calf socks average 16.25 in. from heel to cuff - expect them to cover the leg to just below the knee. 
• A performance fit means no slipping, no bunching, no boundaries. Here's to feeling connected and comfortable in your boots run after run. 
• Multi-zone mesh panels improve venting and flexibility, while reducing bulk and pressure points. 
• Reinforced Achilles and footbeds improve the comfort, durability and fit of our socks so you can wear them season after season. 
• Merino Wool has a natural ability to move heat and moisture, keeping skier's and rider's feet warm and dry. 
• Our silky, ultra-lightweight socks are smooth, breathable, and feel like a second skin between your feet and boots. 
• The “still” in Still Made in Vermont, USA is personal. We knit all our socks at our VT-based Mills - we can't imagine it any other way. 
• Unconditionally Guaranteed for Life - if these aren’t the longest lasting socks you’ve ever owned, return them for another pair.