Our take Tired of playing the on-again, off-again game with your puffy? This lightweight, breathable piece from Sierra Designs is great for dealing with temp swings. Thin fleece side panels under the arms dump heat, while synthetic PrimaLoft Silver insulation everywhere else provides enough warmth for shoulder season when worn alone or colder weather as part of a layering system. One tester, who wore the Tuolumne Sweater during a four-day trip in Wyoming's Wind River Range, reports that it kept him warm over a light baselayer down to 45°F, but also wasn't too stuffy on rigorous hikes when temps rose into the 60s.
The details The Tuolumne Sweater stuffs into its own pocket for storage, and packs down to the size of a soda can. Two zippered hand pockets can each hold a pair of light gloves, while an unzippered interior pocket is a good place to stash snacks.
Trail cred “The 30-denier polyester outer fabric has held up so well this has become my favorite year-round layer,” our tester says.