These shoes do not run large, they are just not to size at all:( I ordered a size 40 (9to 91/2 US) and the toe of my size 9 foot just about reaches the piece that usually sits in between your toes. The shoe is about 1 1/2 inches too long. I own a couple of pais of Birkenstock sandals and compared to these the Papillios are also about 1 1/2 inches longer. There is  I would guesstimate that they are about a size 11 at least. I have no idea where this sizing is coming from or if these are just labeled wrong, but as you have to pay for return shipping yourself I would not gamble on the sizing with these....The style is very cute though.