For winter-level windproof protection, choose the Ferrosi Grid Jacket. Hybrid mapped, bonded grid fleece and award-winning Ferrosi fabric provide durable windproof protection where you're most susceptible to cold temps, and offer breathability where you need to let sweat escape. FABRIC :86% nylon, 14% spandex 90D stretch woven ripstop, 100% polyester grid fleece backer body, 86% nylon, 14% spandex 90D stretch woven ripstop side panels CENTER BACK LENGTH :31” WEIGHT :22.9 oz./650 g