Sleek, trim and lightweight the S51 features Bullard's ribbed and flat front design as well as a rain trough. With a low center of gravity it offers exceptional balance. The slotted design allows for use with attachments such as face shields, welding helmets and hearing protection. Made of high-density polyethylene. Self-sizing 4-point suspension. Microporite Brow Pad. Meets ANSI Z89.1 type I,class E, G & C safety standards. 5100 Series D Hard Hat