The Mountain Heavyweight Shirt delivers the thickness of a light jacket with the familiar feel of flannel, making it the perfect layering piece for chilly weather. This button-up was made with organic cotton yarn, making it softer, more breathable, and friendlier on our planet. Details Rugged shirt perfect for cool weather layering Thick organic cotton twill is comfy and durable Chest and hand pockets stash essentials on the go Relaxed fit allows easy layering over T-shirts