will this fit left or right knee?

It should fit both knees. It is designed for both of them. The sleeve knee braces are where you have to select which knee if I'm not mistaken.

My thigh 19, knee 15.5, calf 15.1. thigh n calf meets m size, but knee is an l. which one should i ordr?

My knee support has a surprising range of adjustability. That said, my choice would be the large; I hope that helps with your decision. My brace is working very well for alpine skiing and has made it possible to continue in a sport I enjoy.

What are the butterfly strap measurements per size? Got a small and outer straps fit, but inner butterfly straps do not.

I’m not sure what you mean by butterfly straps there are 2 straps that you have to put through a little buckle and bring back around so it adheres to the Velcro. It is stretchy.

Does this knee brace have an opening behind the knee?

No only opening is area around knee cap

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🦵 Elevate your game with knee support that moves as fast as you do!

STAY PUT TECHNOLOGY - Anti-migration system prevents slipping, so you stay focused on performance, not adjustments.
UNMATCHED STABILITY - Bilateral polycentric hinges with hyperextension stops protect against knee instability during intense activity.
CUSTOM PRECISION FIT - Top and bottom stretch webbing closures with TPR pull tabs deliver a tailored, secure fit every time.
COMFORT MEETS CONVENIENCE - Wrap-around design allows for effortless on/off while maximizing comfort throughout your workout.
VISIBILITY BREATHABILITY - Perforated neoprene enhances airflow, while reflective accents boost your visibility in low-light conditions.

The DonJoy PerformanceBionic Knee Support Brace in black (medium) features bilateral polycentric hinges with hyperextension stops for superior knee stability. Its wrap-around design with stretch webbing and TPR pull tabs ensures a precision fit, while anti-migration technology prevents slipping. Made with perforated neoprene for breathability and reflective elements for enhanced low-light visibility, this 1.06-pound brace is engineered for active adults seeking reliable, comfortable knee protection.

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