McKesson Procedure Mask ASTM Level 3 Earloops One Size Fits Most (1221960_CS) 500/CSPremium materials provide reliable respiratory protection with optimal comfort and breathability Shingle pleat design prevents pooling and cross contamination; wear mask with pleats facing down Ample length, single strand ear loops are soft, strong, and low profile to comfortably fit most users Adjusts to match facial contours with an enclosed, plastic covered, iron nosepiece Delivers bacterial and particulate filtration efficiencies greater than 95