Filson'siconic shirt is made with medium-weight, breathable cotton flannel that's wind resistant and brushed for soft comfort against the skin. The pleated back provides mobility through the shoulders, so you can work, flex, and stretch in it. Adjustable cuffs and a hem long enough to tuck in keep body provide sustained warmth. The dual expandable chest pockets are built for tools, and the back hanging loop offers a way to display your license easily. This one is built to last through years of wearing.