These are FITS socks. I bought them about two years ago. I wore them all once, but since I don't hike, they were overkill, so I washed them and put them away in a drawer. I've washed them occasionally, so there's some pilling. The middle pair of socks has a slightly different pattern. I don't know the specific type, but I think they're size 25.0-27.0 cm. I usually wear 27.0 cm sneakers. These are perfect for someone who hikes often and doesn't mind used items. I don't have any foot problems, so please be assured.