Sitka’s Mountain Vest features an updated two-way stretch, deadly-quiet, brushed polyester face over 3-layer GORE-TEX INFINIUM™ with WINDSTOPPER® Form Fit Technology. This delivers imperceptibly light and extremely durable protection on blustery days and in light precipitation. The two zippered hand pockets were designed to fit above your pack’s waist belt without bunching when carrying a heavy pack.