Women's Helen Thong Sandals

Wear size 8. First time ordered 38, exchanged for 39. Toe strap cuts into big toe one foot. Little toes up against bed. Do I need 40? How break in toe

Are the size 11 a 41 or 42? I just tried on the 41 at a local store and they were to short.

I wear a 39 is that same as a 9?

what if you are a half size: do you size up or down?