My shoe size is 3.5 so I usually have to try size 3 or 4 in slippers. I already have Lotus slippers in size 3 but sent for both a 3 and a 4 in these. Good job too as they are quite small in size. The 4 are perfect, the 3 tiny. They are beautiful slippers but if you’re a size 4 in shoes you may have to go up a size.