I have been buying these for years and years and they are simply worth every penny every time. They last a VERY long time and stay snug and elastic all day, have a very well vented upper, and stay on your heel properly. They stay elastic for a very long time.I eventually threw everything else out and got nothing but these for easy pairingThese are very comfortable, I used to wear Asics but they clearly have an issue with quality now, so I figured I would try these. They fit me perfectly but I have very large and wide feet so I would not recommend them for someone with a U.S. shoe size of 10 or smaller. They are also the most comfortable socks I have worn so far, however I do see extremely minimal amounts of wear after the first use so these socks I am guessing will last me about three months before I will need to change them out which is not bad at all. Overall I would recommend them, they allow your foot to breath and are very comfortable.This are the best and more comfortable socks I’ve ever worn. They have lasted way longer than regular socks, is why I have purchased even more and will only buy this socks.Better than expected socks from Amazon! Although props goes to Calvin Klein, these are perfect everyday socks. I wear them with running shoes and sneakers. Totally breathable and they do not make your feet sweat or stink!I've become a fan of Calvin Klein underclothes. More expensive generally, but worth it.I bought these for my boyfriend for Christmas. He has had these socks for years and kept complaining about not being able to find them anywhere. They are his all times favorite socks. Well worth the money.Like these socks. Good fit. After following the care instructions did not have pilling issues others claimed to have.They are mens so I expected them to be a bit big, but I like the quality.