3M™ 7503 Half Mask Large (Dark Blue)Soft silicone face piece material for comfort and durability SAFETY SHOE IN NIGERIA 3M Cool Flow Valve: Effective

3M Cool Flow Valve: Effective removal of heat build up provides cooler and more comfortable wear

and the headbands are color-coded for quick and easy identification

where this filter is commonly used

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3M™ 7503 Half Mask Large (Dark Blue)Soft silicone face piece material for comfort and durability SAFETY SHOE IN NIGERIA 3M Cool Flow Valve: Effective3M 7503 Half Mask Large (Dark Blue)Soft silicone facepiece material for comfort and durability. 3M Reusable Half Face Mask, Large, 7503 Product Details Soft sealing surface and low breathing resistance makes them comfortable to wear for long durations Cool Flow Valve helps reduce heat build up by allowing warm, exhaled air to escape Twin filter design for even distribution of weight and minimal obstruction to field of vision Bayonet style connection