Seems like you’re painting with a very broad brush. Ultralight 3L jackets like the Arc’teryx Alpha SL breath way, way better than a standard rain jacket. I actu

Seems like you’re painting with a very broad brush. Ultralight 3L jackets like the Arc’teryx Alpha SL breath way, way better than a standard rain jacket. I actually A/B tested a standard 2L rain jacket vs the Alpha SL in hard rain while working hard and it was no competition. I was clammy and sweaty in the 2L rain jacket in about 90 seconds. I worked over 30 minutes in the Alpha and never got overly warm, and was totally dry. When you’re mountaineering, sweat is really bad news. There’s a reason people wear $600 shells instead of $10 ponchos in the mountains.