Allegro full-face mask respirators are used with air temperature controllers, personal air coolers and adjustable flow control valves to provide clean air. They are equipped with a deep chin pocket, offering a better fit, a hairnet that fits easily under hard hats and a replaceable polycarbonate lens with anti-scratch and anti-fog coatings for enhanced vision. These supplied-air respirators feature silicon-rubber construction and are capable of maintaining shape even in extreme temperatures. They also feature unique over-the-shoulder hose design and an adjustable belt for superior gripping.