"What Our Gearhead® Experts Are Saying: ""I’ve been wearing the Synapse Shirt Jacket on cool mornings and shoulder-season days, and it fills that gap between a flannel and a true outer layer. The extended pockets are super functional, and the overall feel works just as well in town as it does on the trail.""We reach for the Synapse Shirt Jacket when we need a layer that blends everyday versatility with reliable insulation. Its rugged stretch twill exterior stands up to travel, commuting, and field use, while its weather-resistant finish adds just the right amount of protection in shifting conditions. Lightweight PrimaLoft insulation brings warmth without the weight, making this a layer we can comfortably wear all day. Designed with a relaxed fit that layers easily over tees or midlayers, the Synapse transitions seamlessly from town to trail with dependable durability and understated style."