I have only used them 2 times but they work great. I am 5' 9" 155 lb and ordered the Large. They fit fine, not too tight, if anything a little on the loose side. I didn't notice them once I was riding and wasn't in a hurry to get them off after the ride. I haven't had the opportunity to test them in a crash. Hope it stays that way.

Initially thought these would be a distraction, but found when riding that I didn't notice them, and they certainly provide more protection than the armor inserts in my Rev'It or Klim enduro pants. The mediums fit a bit tight, (I'm 5'11'' and 190lbs) but not uncomfortable and, going up a size, I would worry they might be loose. My only concern is how they will hold up over time. I've had good luck with my Leatt armored shirt and neck brace. These shorts work well with my Forcefield knee guards.

Tons of padding
Not too bulky
I’m a size 32 and got a size medium
Fits perfect