I've got the mango medium, (5' 9" 160, athletic build) the fit is dead on. This jacket has been meticulous crafted with super attention to detail. The hood fits excellent with and with out a helmet (I wear a med smith vantage). W/o a helmet the hood hugs the head fantastically. The "Touch Point System?" (the areas where you cinch/loosen the the hood, neck and waist) is an intuitively ingenious feature of the jacket, it works and feels perfect. The overall size of the jacket is great (I've got the med) fully zipped the jack fits right over the face almost up the the tip of the nose for excellent protection form the elements and does not constrict movement. Arm length is spot on for me. Breathability ? Exceptional. I typically wear (snowboarding/skiing) a synthetic power dry base layer with a power stretch mid layer and while charging hard threw trees no clamyness. Waterproofness? It's Gore-Tex Pro shell, tried and true (Iv'e worn various other waterproof/breathable garments including MHW DryQ Elite and the Gore-Tex Pro shell is overall outstanding). Overall this jacket is bomber and wicked versatile, it could be used in various weather conditions; heavy rain, bitter cold gusty whiteouts, bluebird days, ice climbing, you name this jacket will handle any endeavor your willing to take on.