SentinelTM Series Headgear For the ultimate value in lightweight, comfortable face protection, the Bullard Sentinel Series headgear can't be beat. All Sentinel Series headgear include two sizing features for enhanced comfort. The Sure-Lock® ratchet adjusts the headband to sizes 6 1/2" to 8" and it will not slip from the selected size. The crown strap conforms to the shape of the head. The brow pad, made of SportekTM and offered exclusively by Bullard, pulls moisture away from the skin, creating a drier, more comfortable fit. Brow pads are hand washable and replaceable. Sentinel easily accommodates both primary eye protection and half-facepiece style respirators.