WHITINMen's Wide Minimalist Barefoot Sneakers | Zero Drop Sole | Optimal Relaxation

Would these shoes be considered nonslip for work places that require that?

Are the sizing chart and instructions accurate? I measured my sons feet and it indicates he would need a size 14 but he usually wears a size 13.

I ordered a size 13 (wide 13 on dropdown) and they showed up with a 47 size label in the shoe, which translates to a 12.5 us size -- not 13 us. why?

Can you machine wash these?