Fit amazing, Protect amazing!
DO NOT PAY ATTENTION TO OLDER REVIEWS REGARDING POOR FIT!
POC redesigned these since then. They are easy to put on and take off, requiring only 3 straps and one optional sleeve (you can leave the sleeve off if you are pedaling all day). The calf protector is also removable. They articulate with the wearer better than any design on the market. POC really thought this out.
These are the first and only guards I've tried (and I've tried about 6) that don't ride up, slip down, or rotate around. They are surprising breathable. They protect AMAZINGLY well. I have DH crash tested them and they have saved me from impacts that should have resulted in stitches or even surgery. They have the most comprehensive coverage of any guard I've seen.
I've also used Rock Gardn and Roach protectors what slipped up, down, around, and rubbed the back of my knee raw. I've tried at least 3 other types too.
I am 5'10", 165lbs, 31.5" inseam, and I wear the Large.