Brandon P.wrote a review of Flylow Firebird Bib Pant - Men's on December 1, 2017
Familiarity: I've used it once or twice and have initial impressions
Fit: Runs large
I'll start and comment on the sizing. I'm 5'8, 160, wear a 31 waist, 30 length pants and the small fit perfect. I only say it runs large as I think most people in my size range would think medium but if you look at their size guide its spot on. Its not a slim fit tailored cut as you go waist down but I think its a good design for allowing extra layering without having issues restricting movement.
Very very comfortable overall. A lot more lightweight then I was expecting. Given how flylow boasts about how beefy and burley these bibs are, handling gnarly conditions, deep pow etc etc.. it was a really nice surprise to see how lightweight feeling they are. Aka you'll be fine on warmer days and can definitely skin in these. Overall great so far. Can't comment on durability yet but flylow seems pretty committed to that in its mission and I don't see why these bibs wouldn't last.