The versatile Challenger Vest has spandex trimmed armholes and hem for long wearing durability.. Teklon nylon shell. Heavyweight fleece lining for extra warmth. Double needle stitching throughout. Slash zippered pockets interior zippered pocket. Port Pocket™. for easy embroidery access. Binding at armholes and hem. Due to a Tyvek. inner lining a silk screen or heat transfer treatment is not recommended for Goldenrod/True Black.