"What Our Gearhead® Experts Are Saying:""I've been throwing the Open Weave Heavyweight Flannel Overshirt on over everything from base layers on cool trail days to a hoodie on a cold evening around the fire, and it works every time. The cotton twill has a satisfying weight and structure that feels genuinely durable, like something you'll still be reaching for ten years from now.""The best overshirts are the ones that feel like they've been around forever the first time you put them on, and the Open Weave Heavyweight Flannel Overshirt from Marmot earns that feeling without any effort. Cut from a heavyweight 100% cotton twill with a brushed open weave texture, it's a snap-button classic that belongs anywhere the day takes you, from a crisp fall trail to a long evening at the campfire. The relaxed overshirt fit is built for layering over a midlayer when the temperature drops and wearing solo when it doesn't, and the substantial 333gsm cotton has enough structure to hold its shape through a full season of regular use. This is the shirt you grab off the hook on the way out the door and forget to take off until well after dark."