The BOSTON thermal long johns from The Duke Clothing Co’s D555 brand are designed for superior thermal warmth and everyday comfort during colder months. Crafted from a soft, insulating blend of cotton, polyester, and viscose, they offer excellent heat retention while maintaining breathability. Finished in sleek black, they’re easy to pair with other garments, whether worn as a thermal base layer or as relaxed loungewear. The elasticated waistband ensures a secure, flexible fit throughout the day. Ideal for layering during outdoor activities or staying warm indoors. Available in sizes 2XL, 3XL, 4XL, 5XL, 6XL, 7XL and 8XL, with coordinating thermal short sleeve and long sleeve tops also available for complete protection and comfort. A dependable base layer from D555 by The Duke Clothing Co, created for Big and Tall men and made to fit you.