This insulated jacket is made with a 3-layer fabric that is water-repellent, waterproof, and breathable, making it suitable for all weather conditions. It uses THERMOLITE, a lightweight and warm high-performance fiber. This jacket alone is warm, but you can eliminate any concerns about the cold by wearing the NAVIGATORS VEST over it. It's a reliable item that's easy to throw on and keeps you warm. Materials: Main: 100% Polyester Lining: 100% Polyester Insulation: 100% Polyester Separate Fabric: 100% Polyester Worn a few times. Thank you for looking.