Got the red ones for my 10 year old to go to baseball. Big size hardly fit him. He has shoe size 6.5 for tall children / 7.5 for women / 5.5 for men. At the heel of the sock you have to pull a little to reach the heel. Otherwise he says they are comfortable. There seems to be enough room in the sock. Not too fat. I can't comment on durability as I've only worn it once.