Sitka Jetstream Insulated Windstopper Muff - The Jetstream Insulated WS Muff traps heat like a furnace and locks it in like a fortress. With the extreme efficiency of PrimaLoft Silver insulation and WINDSTOPPER by GORE-TEX LABS, hands are untouched by the deep freeze and high winds of late season. It has an internal pocket for hand warmers, an external zippered pocket for storage and an adjustable waist belt. WINDSTOPPER by GORE-TEX Labs cuts wind and repels precipitatio Primaloft Silver insulation Internal pocket for hand warmers Adjustable waist belt Low-profile clips for attachment to Flash Optics Harness External zipper pocket 9.8oz / 276g Style: 600493