The Grundens Kodiak Insulated Long Sleeve Shirt was designed to provide you with superior warmth and comfort on the coldest days. This heavyweight flannel is constructed from a durable 210-gram polyester exterior fabric that ensures long-lasting wear and tear resistance. Additionally, the shirt features a 160-gram insulated fleece lining that provides excellent insulation to keep you warm even on the most frigid mornings. This high-quality material not only delivers exceptional warmth but also offers a soft and comfortable feel, making it perfect for extended periods of wear.