I've had the Flex 3 for a couple of years as well, and it's a great jacket, however with *this* problem:
I have an athletic build also, and except for your long arms, I've got very similar specs. I have a 44" chest, and I was a MED in the Flex 3! I have to assume, in the summer without the insulated liner, or rainproof over-layer, the main mesh jacket must hang on you in an XL (I'm 5lbs. more than you)! That's a problem if you actually go down. Nothing (armor) will stay put.
That being said I *do* love the jacket, and use it with with and without the liner. The waterproof bit makes it too tight (3 layers at that point), plus it's SIX zippers to get on. By the time I get it on, it's stopped raining!
So, I've done this. I've moved to an Olympia Switchback (in the Hi-Viz yellow, which looks pretty good for a hi-viz) and fits very similarly in L to the Flex 3 in MED. It has similar mesh with an *inside* waterproof layer, that can also be standalone. Two zippers to get in and out, and it gets me down to 50F very comfortably. Lower with a thermal shirt underneath. I haven't seen how high I can go, but it flows air (mesh alone), as well as the Flex 3. For below 45F I switch to a jacket that's really purposed for cold weather (FG Kilimanjaro), which has taken me down to 11F this past winter, comfortably. So, yeah, it's two jackets, but trying to get one jacket to address sub-freezing to broiling weather is futile IMHO.
Oh yeah, one last thing.. it's *real* CE armor in the back on the Switchback, not a piece of crap foam. And, the elbow armor comes down the forearms as well... Much better protection than the Flex 3.
2017 Pearl White 650[/B]
AdventureTech lowering links and GPS mount
AdventureTech +2" SS braided brake line
GPI spools, SW Motech risers
Givi XS307 Tanklock bag and Givi 46L top case
Suzuki hard case saddlebags
Last edited by BKP; 03-26-2014 at 11:59 AM.