AOSafety Escape Hood CB (chemical-biological) Plus boasts a blower to filter incoming air. Blower eliminates breathing resistance and prevents fogging, making hood easy to don and comfortable to wear. Automatically turns on when Escape Hood is removed from storage case. Stretchy neck dam fits over any size head and accommodates glasses and facial hair. Hood features no mouth bits, nose cups, or straps. Provides wide, unobstructed field of view.