These socks are awesome! They are very comfortable and fit great. Not too thin, not too fat. They have rubber padding on the back of the heel to reduce slippage, but to be honest they fit so well that slippage isn't an issue. I bought similar Vans socks and hate them. Too low and although they also have a rubber grip it didn't help. I have purchased socks from Under Armor before and have always been happy with the fit and quality. I'm glad I tried these. I will definitely buy another pack or two.