The straps should fit you. The electrodes are set in their flexibility, but the strap that holds the device and that covers the electrodes wraps around my calf 1.5 times. I am 5'9 and in the military so I don't have small calves, but I have average ones. So, it should work. If not, Best Buy does a 14 day return and Quell does a 60 day return.