I've bought K2 Charm size S for my GF as a b-day present. She has 35.5 EUR (5.5 US) Thirty two's boots. The size chart for the bindings puts size S up to 36 (6). However, I am not sure if they are not too small and I shouldn't return them. The straps fit well, the boot is snuggle in the chassis but the overhang over the toes seems too big:
Do you think they are too small? She always used to wear size S with these boots, although different brands from rental shops.