Size tip: 
Ⅰ. Slipper runs a little SMALL dut to thick foam.
Ⅱ. We suggest you get ONE SIZE UP. (Wide or swollen feet get TWO SIZE UP)
Ⅲ. If you wear a size 8/8.5 in regular shoe, a size 9 will likely fit you best (wide or swollen feet get a size 10).