These socks use combed cotton yarn, which is a very soft version of regular cotton. Combed cotton doesn't have any impurities or short protruding threads, is stronger than regular cotton, and is made by treating the cotton fibers before they are spun into yarn.
My wife and I received one pair each for Christmas. We both fell in love with these Chup socks. We searched online and found the Chup website, and ordered several more pairs in different designs.
We found these socks to have an excellent fit and are very comfortable. We will surely order more.