(5'7", 140 lbs, small/medium build, Size S jacket/fleece)
I got my Stoic shell and the next day it started raining, perfect timing. It was fun to watch light rain literally bounce off the shell fabric, I didn't even feel damp after an hour of light drizzle. I got to test the flexability of the jacket and the material on a gnarly cliff approach and a morning of climbing in drizzly conditions, everything worked well and even though I got the slim-fitting small, there was the prefect amount of stretch and fabric to go for the big reach moves without the jacket riding over my waist. The afternoon of the climb turned into flash flood conditions: 40 miles per hour winds, rain going sideways, hydroplaning vans, useless windshield wipers. I ducked out of the car with the Stoic already on and watched as everyone else ran for cover. I strolled across campus totally dry while everyone else hid indoors. Twenty minutes later my core was still dry with a little bit of soak through around the cuffs and the hood brim where there is some elastic fabric. The pockets and vents are well placed and the zippers slide like magic. Layered over a backcountry midlayer it is snug and going up a size may be a good idea, but not necessary if you are okay with a close fit. This shell is going to replace my ski shell and even without the powder belt it should work great.