Rugged and Comfortable Respiratory Protection, the 3M™ 6500 Reusable Respirator offers the following features: Silicone Faceseal - Provides comfort and stability with a soft, but firm faceseal. - Provides long life with a resilient silicone material - Our lightest silicone facepiece - Keep its shape under high heat environments Quick Latch - Drop Down Mechanism - Easy on and off as you move in and out of contaminated areas - No need to remove your hard hat or face shield when lowering or raising your respirator. Adjustable Head Harness Assembly - Optimum fit and comfort with four point adjustable cradle - Lasting performance and improved elasticity Polyester/Spandex straps Overmolded/Low Profile Design - Simplified cleaning and maintenance with fewer parts and crevices - A good fit on many faces with a smaller faceseal footprint. - Improved compatibility for use with Welding/Grinding Shields - Advanced half facepiece design for a wide field of view 3M™ Bayonet Connection - Compatible with all 3M™ cartridges and filters Coolflow™ Valve - Enhanced comfort by reducing heat and moisture - Easier breathing with unique valve design Valve Cover design - Directs exhaled breath and moisture downward - Easy positive pressure seal check