I’ve had the hardest time finding no show socks (specifically for my Ecco shoes) that stay on all day without sliding off my heel. I’ve tried expensive Nordstrom socks all the way to Costco socks. I did find a pair in London, England that I loved and bought, but that was all the way across the pond, and out of reach to buy. I browsed through no show socks and saw a lot of positive reviews on this specific type of sock, so I said what the heck, and bought into it. I left it in the bag for two days in my house before trying it on because I had a sinking feeling that these socks would be like all the other socks I’ve ever bought. I finally sucked it up, opened the package and tried them on. They felt nice, and formed to my foot nicely. For reference, I have between a size 10.5 to 11 shoe size. I walked all around the house in them without shoes on for hours. It didn’t slide- heck, they didn’t even move. Being the slight pessimist I am, i put on my eccos to really test it out. Would they slide? Again, I wore them for hours. And lo and behold, i found socks that could be at my door in 2 days or less (vs across the pond). So glad it came with several pairs because I love these! They stay on without sliding despite my large shoe size, and are very comfortable! The only recommendation I would have to the seller is to make a combination in black and nude or white and nude.