Made with stretchable, 100 percent polyester fabric, this 6810 Half Style Stretch Cap is a perfect accessory to keep your ears and head warm in cold weather. Fabric creates a snug fit that keeps cold out. Stretchy material provides room for most head sizes yet is formfitting to combat the cold. It even fits over the wide lip on hard hats to trap heat. Cap is great when wanting to stay warm but not wanting extra material underneath headgear. It's a happy medium for both warmth and protection.