The Men's Lightweight R4? Jacket provides windproof protection for cold conditions in a single, stretchy package. Warm and stretchy, our Lightweight R4? Jacket provides windproof protection during high-output activity in cold conditions. A low-nap microfleece face and high/low grid interior sandwich the Polartec? Windbloc? laminate, while unlaminated R1? fabric (now made with recycled polyester) underarm panels enhance breathability and mobility. A neck gasket seals out the elements, and seamless shoulders allow pack-wearing comfort. With three external pockets (the hand pockets stay clear of your harness), two drop-in internal pockets, a drawcord hem and a clean, slim fit that accommodates underlayers. 100% recyclable through the Common Threads Recycling Program.