This jacket is waterproof like a boss. It is so soft, stretchy and smooth yet completely impenetrable. It is also ridiculously light and packs down to about the size of a small pumello/large grapefruit. It has become my go to shell for wet, windy, or cold situations. I'm 5'10 and 155ish lbs and the medium is a perfect athletic fit, although it is a bit snug over my Marmot Zeus (also a medium). Fits perfectly over my Nano Puff and North Face Khumbu (both medium). The material is much more durable than other rain shells and has held up through bushwhacking and even Joshua Tree monzogranite. Definitely stretchy enough for unencumbered climbing. No pit zips, but the jacket is so breathable I don't miss them at all. Also the pockets are huge, they go all the way up to your neck with solid waterproof zippers. I exchanged my North Face Venture for this jacket because it soaked through after 20 minutes on a drizzly trail and every time I rode by bike through rain and now I couldn't be happier. I definitely recommend this jacket to anyone looking for a great, lightweight, soft, stretchy, quiet, impenetrable shell for their system.