I'm having a hard time finding all the cotton socks for my daughter. Your feet sweat, and many companies only make socks out of polyester, which is not breathable, so your feet get sweaty. I bought them because they were advertised as being mostly cotton. Although they have enough synthetic fabrics. I bought them and washed them and literally after one sock my daughter put a big hole in the heel of a sock! The socks are cute and fit well. I just wish they had more cotton and were more durable.