5 shoe, so I purchased size 11 and it fits perfectly. Now they fit PERFECT. They are blue when a device is in the charger and red when it is not. There is also a sticker listing technical specifications specific to the CSA. They took an already amazing design and made it much better. The battery life is good. But I suspect that all wet-application films will have this same problem, that is, durability over time. These headphones I think are audiophile headphones disguised as bass head cans. The first time the batter quit holding a charge after a couple of years. I purchased the black with the cable knit top.