Sockwell Women's Rainbow Run Socks 35% Stretch Nylon, 30% Bamboo Rayon, 30% Stretch Nylon, 5% Spandex Made in US Jacquard knit design for a great new look Spandex throughout the sock prevents slippage and ensures a snappy fit throughout the day Ultra flat toe seam for superior in shoe comfort Non cushion sole Y Heel shape design for better fit