Patagonia has discontinued the M10 Jacket.
Though the Patagonia M10 is fantastic, our testers prefer the Arc'teryx Alpha FL (4 oz. heavier) for alpine and ice climbing and backcountry skiing because of its more ergonomic fit, larger chest pocket, better aesthetics, and astonishing durability. For many people, and backpackers specifically, the M10 could be the best hardshell due to its extraordinary light weight and tiny packed size. It does come with a laundry list of limitations, however, and thus is only recommended for someone who needs a very specific type of jacket.