Teko M3RINO.XC Merino Wool Midweight Hiking Socks for Men and Women, Charcoal, Medium 100% Spandex A versatile sock engineered for performance and comfort Anti-welt double cuff and interwoven Lycra provide a comfortable fit and superior support with less bunching The reinforced toe and Y-heel increase durability Air vents let your feet breathe and dissipate heat Lifetime teko guarantee and Made in the USA Made in the USA