Birkenstock Madrid Birko-Flor worn but in great condition

I loved this style of Birkenstock. I have many pairs of these shoes for their comfortability and style. This pair was too similar to others I own so they were only worn a few times and are in great condition. If you know Birks, you know the oils of our feet stain the footbed within a few minutes of wearing. These shoes were worn a few times but the tread on the bottom of the shoes are in perfect condition. These shoes are a 4-4.5 but fit a size 5 or 6 regular shoe. For reference I wear a 6 in Nikes but wear a 4 in Birkenstock. Please note this is a SIZE 4-4.5! Poshmark doesn’t offer a size smaller than 5 on the size selection. Thank you!