Really just tiny adjustments. My story:1st - I wear a size 11 normally in a medium width weather heels, sandals, or a gym shoe. Bearbeitung und Qualität ist gut. I wear a womens 7, but since I wanted to wear these with socks for working in the garden, I puchased a Womens 8 and they fit great with socks. Honestly can?t believe they?re under £20. Birkenstock recommended the EU41 based on my foot size of mm 267 x 105 (253 circumference width). Ive even used pliers to tighten it in the mic and it still comes lose. My mom spends alot of time in slippers since she doesnt really go anywhere and she says these are the best ones because they dont hurt her feet. Updated 2 months later. Ordered a size 10, which is my normal size.