These MSA caps are number one for most industrial applications. Durable, injection-molded, high-density polyethylene shell is designed with accessories slots to accommodate many add-on features. Also includes a Cushionaire™ sweatband and adjustable crown straps. Meets ANSI Z89.1-2003, Type 1, Class E.Available with four types of suspensions: the Fas-Trac ratchet suspension is a 4-point webbed system with a large knob for easy adjustment; the Staz-On pinlock suspension is a comfortable, 4-point webbed system; the UniPro is a 4-point, one piece plastic baseball-cap-style pinlock adjustment system; and the 1-Touch is a suspension that provides an easy squeeze opening, adjustable dual nylon straps, and one-hand slide adjustment for a stable and comfortable fit.