PATAGONIA Mens Jacket Style: Polartec Alpha Mars Level 3A Bomber Style Color: Sand Light Tan Brown Military grade Insulated Jacket Coat Excellent Used Condition. Minor markings and snags as seen in pictures, but very unnoticeable as blends in with jacket. Smoke-free, pet-free home. Patagonia Polartec Alpha insulated jacket as part of MARS (Military Advanced Regulator System). This was invented for the U.S. Special Forces. They required a superior insulation system for extreme temperature variations and the start-stop conditions of combat. Polartec Alpha regulates warmth, is fast drying, lightweight, has advanced breathability and is highly durable. Patagonia discontinued production of this jacket. This is an unique and rare item made in the USA. Polartec Alpha insulation Chest pocket, 2 hand pockets. Zip Up. Bungee Adjustable Interior Waistband. Made in USA for the US Military