Based on others reviews about the size issue I figured I'd just get my regular size. Worked out well. It is a ltitle snug and a slightly larger size would give me more room, but I'm ok with how it is. They keeps my always cold feet and toes warm and I have no complaints. I see how the black stuff can occasionally come out but it rarely does for me. Sometimes a few specks are on my socks but it really is no big deal. I wouldn't recommend going barefoot with these though, as the black stuff will stick to your feet - sweat or no sweat - good slippers =)