Featuring Light Elite cushioning, these ZQ Certified Merino wool running socks contain targeted cushioning placed where runners need it most, on the ball and heel of the foot. We've packed these socks full of smart features like our 4 Degree elite fit system, women’s specific mesh ventilation zones, and a Virtually Seamless toe.Features PhD: Built for Performance in the Highest Degree Women's specific fit: narrower heel and slimmer fit 4 Degree Elite Fit System: For a dialed, performance oriented fit with flex zone at ankle joint Indestructawool: Indestructawool technology features a patent pending construction method for exceptional durability and comfort Mesh Venting: Mesh ventilation zones provide optimum moisture management and maximum breathability Light Elite Cushioning: Maximum impact protection with targeted cushioning on the ball and heel of the foot. Designed specifically for runners. Sock Height: Low Cut 2.25" overall height Virtually Seamless toe for enhanced comfort Made in USA of Imported Yarn: 52% Merino Wool, 45% Nylon, 3% Elastane