I bought them with reservation because I have bought several socks over time that claim to be 100% cotton and I have been disappointed. If I put any other material on my foot, it irritates me, so I want a specific texture in my socks. Well, these socks are exactly what I want. Thin, cotton, my feet don't sweat even in the summer, and the elastic doesn't cut into my skin even when I wear them to sleep. You don't even feel like you're wearing socks. The downside is that the black ones I bought attract lint like a magnet. I will buy the same series in the other colors.