To order the right Bont boot you first need to measure your foot. Using this link measure your foot: (how to measure your foot). Now using that measurement find the European or American size below that comes closest to the measurement you got then go down one size. My foot is 270 mm long and I wear a size 9 1/2 street shoe. Looking at this chart would think I would wear a size 9.5 Bont boot. Actually you want to go down 1 size from what this chart shows so if it shows a 9.5 then you would get an 8.5. There is no 8.5 Bont boot so I have to wear a size 9 as the size 8 is to small for me. An 8.5 would be perfect for me if there was an 8.5. Bottom line go one size down from what this chart shows for buying a Bont boot.