Weighing less than 5 oz. the JSP HardCap Aerolite™ Adjustable Baseball Bump Cap Micro Brim can be worn all day without any discomfort, as the increased ventilation provides unparalleled coolness and comfort. The protective HDPE liner is removable, so the outer cap is fully washable together with its plastic brim. Designed as a safeguard against accidental bumping and scraping of the head, this cap is perfect for working areas where hard hats are not required. Important Note: Bump caps are not designed for use in ANSI-designated hard hat areas.