Description of Marmot Afterburner Vest Potent Windstopper® warmth in a minimalist package: the Afterburner Vest is ideal for aerobic sports in cool weather and as an extra layer of versatile mid-layer insulation in cold weather. Features: Weight: 1lb 0 ozs / 454 g Shell material: Micro Fleece P-720 Windstopper® Reinforcement: M-300 Nylon Taslan Gore Windstopper® Roll over wind flap behind zipper Designed to fit over a light layer Nylon shoulder reinforcement Hidden back zippered pocket Elastic draw cord hem for adjustability in serious weather Zip handwarmer pockets soft fabric to warm hands