Reposhing this item I purchased from @nrsamyb. Love them, super comfortable but they run large. Worn twice Since 39 can be 8 or 8.5, I’ve related as 8.5 but I think they run a bit large for 8.5. I’d estimate they run 25.3cm interior and 25.5 exterior length and 9cm ball of foot width. They do not fall off my size 8 foot since the back has elastic. Questions? Leave a comment below!