The Breaker is a midlayer by weight, but an outer layer by function. It’s heavy enough to handle early season chill over only a T-shirt, and its relaxed cut can fit comfortably over multiple layers. Nylon face fabric resists wind and light rain. “This was perfect for spring days when I needed more than a single layer on,” says our Colorado tester. “It remained buttoned over a baselayer in cloudy weather, and then I’d open it when the sun came out.” Caveat: The material feels scratchy when directly on the skin, especially under pack straps.