I bought 5 pairs as a repeat very satisfied customer. I have been running in these socks for years and love them. The new pairs are slightly different. They fit fine, the same. The material seems different. I only noticed because on my last trail run my feet felt slippery in my shoes when on rocky, unstable terrain. I compared the new ones with old pairs and the texture on the bottom is different. As soft and comfortable as they feel to my feet they are now more slippery. If you have any room at all in your shoes to move around I feel you will. For now they’re still my favorite running socks but I feel I’ll have to watch for hot spots now.