Nike sample, never sold to public. This is a one of a kind I bought from a former Nike employee on Poshmark. They look great and I planned to use for light running and around town. I wore them at best 5 times inside and one 2 mile run. They look flashy but unfortunately I haven’t used them enough to keep. Men’s size 10 and the flynit design fits a bit snug, but not much. Let me know if you have questions. Thanks!