Model K Headgear with Ratchet Suspension, Sweatband, Adjustable Fit Meets ANSI Z81. Headgear is made from High Density Polyethylene (HDPE). Whether the need is for welding protection in a steel fabrication environment, head protection on a construction site, or hearing protection at an airport, Jackson Safety provides the widest range of safety choices to meet the needs of every job and every worker.