I really like these shoes as they are comfortable, and look stylish.  Based on some reviews, I did order a size up, and I am glad  I did.  I am between size 12M and 13M, depending on a shoe brand.  I ordered a pair of these in size 44 (US size 14), and they fit just right length wise.  Overall it's a comfortable shoe, which has a great arch support, and the comfort lasts all day long.  My only complaint is that this is the only style this company makes in size 44, which fits a US size 13, not 14.  I wish I could purchase some of your summer shoes/sandals, but most of them only come in size 42 or 43.