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I try to keep my layering system simple. For high-output touring, I like a light baselayer, a super breathable midlayer, and a storm shell to throw on when things get nasty. I’ve been using the Scott Nine9 as a midlayer for Grand Traverse training because it just plain works. The 40-percent merino wool stretch fabric and 100-percent wool insulation vents fantastically, even with a pack on my back. It stays warm while damp from perspiration, and the DWR coating on the polyester ripstop front keeps light snow at bay. I wear this as my outer layer while I’m touring then toss on a shell or down jacket for descents. Plus, it’s insanely comfortable, which counts for a lot in my book. [$200; scott-sports.com]