description says lightweight cotton, so since it doesn't show any of the other materials, I believed it to be simply lightweight cotton, and cotton only, no synthetics. All cotton. I should have called customer service. I'm pretty bummed, because the pair is still sitting in my bureau. I'm very far from my post office, so returns aren't as easy for me. The color is pretty. It's 68% cotton, 16% polyester, 13% nylon and 3% spandex.