Sz 39 = Real fit = CND sz. 8-8.5 (or a short 9).  Suitable for a narrower foot. Rubber soles, anti slip, very comfortable & good support.
 
For very high arches we recommend ordering one size up from your regular size as there is no elastic stretch.
Should fit snuggly as they do stretch when they get wet.
 
Remove leather lined footbed to dry.