For the most accurate measurement, use a soft measuring tape.
To get your top strap measurement, wrap the tape around your leg just above your kneecap, rather than high up on the quad. To get your bottom strap measurement, wrap the tape around your leg just below the kneecap. No need to pull the tape too tightly!
What’s most important is the strap overlap. You want the longer strap to wrap over the shorter strap and reach as far across as it can; the overlap is where the strength comes from. If you find you are between sizes, the top strap is the measurement that matters more.
If you find that the top strap pops open, you probably need to size up for longer straps. If this happens, stop wearing your Bee’s Knees, keep them clean, and contact Bee for sizing and exchange info. We are happy to help you find your fit!