Not bulky like a hard hat, bump caps look very much like soft, fabric baseball caps, and they're typically worn in spaces where head protection against worker-generated impacts may be desired, whether the wearer is concerned about low-clearance ceilings, structural beams, pipes, conduits or other low-hanging hazards. From machinery mechanics and airline baggage handlers to general maintenance personnel, wherever hard-hats aren't required or desired, bump caps can be ideal. The Skullerz 8960 Bump Cap with LED Lighting takes that concept and runs with it. Patented, built-in LED lights under the cap's brim emit a consistent 48 lumens for hands-free visibility in areas where lighting is limited. Simply squeeze the under-brim switch to get more light on your task. Four included CR2032 lithium-ion batteries deliver up to 30 hours of continuous illumination on a single charge. Removable, impact-resistant, ABS plastic bump-cap insert features a patented flanged design and a foam-cushion liner to maximize both airflow and wearing comfort. Durable, nylon-fabric cap shell features a distinctive baseball-cap-like design with breathable mesh panels to aid in moisture wicking and tasteful, 360° light-reflective piping to help ensure that the wearer remains easily visible, night and day. Fabric shell is hand-washable—always remove the batteries and ABS plastic bump-cap insert before washing. Short Brim. Style: Bump Cap; Material(s): ABS; Nylon; Adjusting Method: Hook & Loop; Thickness: 0.26 mm.