Men's Woodhacker Heavy Twill Shirt Jacket: Roughhewn heritage, easy-wearing lifestyle. Starting with the rugged cotton twill shell and waxed cotton/polyester canvas overlays at shoulders and forearms, this shirt jacket won't shrink from hard work. Inside, 60 grams of ThermaFill® insulation in the body and 40 grams in the sleeves provide chill-fighting comfort. Snap closures at center front, chest pocket, and cuffs.