Sockwell Men's Trilogy Socks 33% Merino Wool, 33% Bamboo Rayon, 29% Nylon, 5% Spandex Made in US Jacquard knit design for a great new look Spandex throughout the sock ensures an uncompromising fit from the beginning to the end of the day Ultra flat toe seam for superior in shoe comfort Y Heel shape design for better fit Turn welt top helps keeps the sock in place Jacquard knit design for a great new look Spandex throughout the sock ensures an uncompromising fit from the beginning to the end of the day Ultra flat toe seam for superior in shoe comfort Turn welt top helps keeps the sock in place