Arc'teryx Acto MX Hoody
Take the weather resistance of the best softshell and marry it to the breathability of an unlined fleece, and you have the Acto MX. “It’s great for high-output activities in the alpine,” said one tester after climbing the Breithorn outside of Zermatt, Switzerland, on a crisp, bluebird day. This 16-oz. jacket pulls double duty as an outer shell with high ventilation and a DWR treatment that beads water (good for the ascent), and as a midlayer beneath a hardshell when you need to take full advantage of the warm gridded fleece backing (nice for descents and rest breaks).