Dearfoams Women's Alpine Moritz Bootie Slipper

Where is the sizing chart? what’s medium? what’s large? what’s extra large? how am i supposed to know what size to order without a size chart?

Does the front flap flip up?

I wear a 38 in european sizing and an 8.5 in us, should i go with medium or large? i do not want them to feel sloppy.

can the front be worn up?