I'm a 6' 1" man with a size 13 foot. I bought the 13-15 crew socks and put them on. First thing I noticed was the bottom of the sock seemed too short, specifically where the thicker material around the foot meets the thinner and stretchier material near the ankle. For me, that is right under my heel and it feels weird, like the bottom of the sock is an inch or two short. Also, when I'm walking around on my wooden floor, the grips do seem to come in handy, until I try putting on a shoe. My slip-oSee full review