Allegro Industries 9909-RD hard hat hood, ratchet. The design of our unique disposable double Bib hood offers even greater protection for workers by allowing Extra space for a hard hat. Lightweight, rugged, and reinforced down-tube with swivel connection gives added flexibility. The double Bib Style means increased protection by simply tucking the inner layer into the protective clothing. Niosh approval number tc-19c-409. Niosh approved. Valve Sold Separately.