I am a size 6 foot so I purchased the size Small, they fit great! Just put the socks on the same way you put pantyhose on, this makes it a lot easier. I use these for recovery, I backpack a lot so I will take these in my pack and once we get to camp, I'll put them out and wear them around. They are lightweight and very breathable. My toes don't feel crunched in them at all. Very comfortable!