Nice cotton socks that are not thin. After wearing the first pair, my son requested only these socks from now on... Please note that Amazon sizing guide is inaccurate for this item. I originally thought I was buying this for a 4 year old. Worked for me in either case, because it fits my 8 year old (size 34 shoe) just fine. The sizing guide provided by the seller images is accurate. The heel/toe grey finish is nice and thick.