Size EU40/US 8-8.5 fits women 8.5-9.0 AAA. Wanted this style for walks on the beach and as Vibram shoe sizes are so inconsistent I took a chance and they fit! Added dr Scholl Tri Comfort heel lift. Ideal for rocky beaches, muddy lawns. Much easier to put on and cooler to wear than neoprene. There is also a pair for physiotherapy exercises.