Our windproof Lightweight R4 fleece stretches and warms, but better suits high- output activity than our burlier regular R4 fabric. (See our windproof R4 Jacket on the back cover.) R1~ underarm panels enhance breathability and mobility; a neck gasket seals out elements; seamless shoulders allow pack-wearing comfort. With three external pockets (the hand pockets stay clear of your harness). two drop-in internal pockets and a hem drawcord. Imported M's Lightweight R4 Jacket