No shirt. No sleeves. All service. 12.5 oz. 100% cotton canvas shell, 280g, 100% polyester double-sided fleece lining, exterior and interior zippered pockets for stowing your gear, side seam zippers for cinching the waist in, streamlined shoulders and a low-cut collar. It'll help take the edge off cooler weather, but won't get in the way of getting the job done.