I am up in the air about trying the size 8. Returning it ASAP. The length of these sandals were a normal size 6, however the top band is extremely tight. Half sizes would have been great. I bought an 8 and it fits PERFECTLY. The sound is nice but I didnt feel much of the "vibration" when explosives went off etc. , you have adjuste volume of your phone also so you can get maximum volume. I expected better, this thing is a major disappointment. Battery life is 15 min at the most. Regardless, they seemed to lose their charge after only 15 minutes.