Expect it to earn a permanent place on your coat peg. The Fire Hose® Limber Jac is just as tough as you'd expect a Fire Hose shirt jac to be – made of rugged 100% cotton canvas. But at 8 oz., it's a lighter-weight canvas that's great in milder weather or when you're on the move. Lined with comfortable, chill-chasing flannel that won't overheat you or weigh you down. Armpit Gussets guarantee you're never held back when you reach, swing or go through any contortions needed to get the job done. Even has side hand-warmer pockets – a feature you demanded!