These were the thickest no-show black socks I could find. I figured if they weren't thick enough I could double up. I have a pair of Clark's slip-one that fit oddly. Too loose around the opening where my foot enters the shoe. These socks did a good job of filling in so that the shoes feel more snug. I haven't gone for any longish strolls with these socks yet so don't know how well they stay in place.