I stumbled across this brand of no-show socks at a discount department store about 4 years ago and fell in love. When The 21 pack from Amazon at $24 was a value I couldn't pass up. These socks are the only brand that do not slip all day - even a whole week at Disney World walking over 30k steps a day. These socks have extra elastic around the heel along three wider grip strips that really secure the sock to your heel. They also have an extra elastic support that runs through the arch and hugs the top of your foot to cinch in the sock around the arch, further helping these socks not slip off the ankle. That material is soft and not so thick as to make shoes feel tight and not so thin that it loses moisture wicking properties. Overall, I cannot recommend these socks enough - you will not regret these!