What Our Gearhead(R) Experts Are Saying:"The Filson Ultralight Vest is the layer I reach for when I want core warmth without restricting my arms. The PrimaLoft Gold holds up when the weather turns wet on the trail, and the Moleskin-lined hand pockets and collar are a comfort detail that makes it noticeably better to wear than most packable vests. It layers well over a midweight base on cold mornings and packs down small enough to keep in a bag all season."Filson's Ultralight Vest delivers core warmth through 60g PrimaLoft Gold insulation - a synthetic fill that retains its warmth in wet conditions and packs down small enough to disappear into a bag between uses. The 1. 5-ounce ripstop nylon shell keeps weight low while holding up through daily wear, and the elastic binding at the armholes and hem creates a clean, close fit that seals warm air in without bulk. The cotton Moleskin lining in the hand pockets and collar stand adds a layer of comfort that holds up through long days on the trail or around town, and the interior zippered security pocket keeps valuables close. It layers cleanly over a flannel for a cold morning hike or under a shell when the weather turns - a core layer that earns its place from the first cool day of fall straight through to spring.