6670CT Cooling Neck Shade for Hard Hat protects neck from sun exposure. Evaporative cooling qualities activate when neck shade is submerged in water. It remains cool up to 4 hours. Run the neck shade under water to reactivate the cooling mechanism. It attaches to most hard hats and safety helmets with the hook-and-loop straps. Long, wide neck shade provides coverage for neck and ears, reducing heat stress and sun damage. Neck shade is ideal for those working in the heat, including construction, roofing and landscaping. Use it to reduce the risk of heat stress while mountain biking, motorcycling, hiking and more. Machine-wash as needed and hang dry for longest life.