SITKA Gear Men''s Grindstone Work Jacket: The Grindstone Jacket brings the rugged durability of a classic work jacket to the jobsite while enhancing comfort, function and weather protection with key technical upgrades. GORE-TEX INFINIUM with WINDSTOPPER Technology provides a barricade against the wind and PrimaLoft Silver insulation adds the warmth, weather protection and breathability needed to stay active and comfortable in the cold. Designed to move freely and featuring a durable double canvas construction, the Grindstone gets it done when Mother Nature brings the cold and wind to your workday. SITKA DESIGN: Hunting is an exercise in humility. We might be at the top of the food chain, but when it comes to fair chase pursuits of species that evolved over thousands of years to survive relentless predators and the harshest conditions imaginable, we are simply outmatched in the wild.Gear has the potential to level the playing field. It can help us integrate with the natural world and to go places and withstand conditions we never thought possible. It can improve focus, success, safety and enhance the entire experience. Hunting demands a lot from our gear, and we are committed to providing the advanced fabrics, smart design and specialized features hunters deserve. This commitment to innovation continues to inspire everything we do.