Ergodyne - EGO23366 At less than 5 oz., Skullerz 8955 Lightweight Bump Cap Hat with short brim delivers optimal comfort without compromising safety for protection against bumps, scrapes, bruises and other minor head injuries. Removable bump cap insert is made of a lightweight yet durable, high-density polyethylene (HDPE) with maximum ventilation for all-day breathability. Removable, washable and antimicrobial EPP foam liner offers enhanced protection, airflow and comfort, preventing sweat from dripping down into eyes. Vents in the insert and foam pad channel heat away from the head. This safety bump cap meets the EN 812-2012 standard for industrial bump caps. Not bulky like a hard hat, bump caps are typically worn in spaces where worker-generated impact head protection is needed, like low ceilings, beams, low pipes and other bump hazards.