I've been up 10 hours a day in a pipe mill so far I would say these are some of the best boot socks I've ever had, I wear them underneath a circle white cotton socks, i've had them for about a month now and so far i've been satisfied enough to order a second set, as always when i find something i really like it gets discontinued soon after, lol , for the price it is great value for money and so far they fit perfectly