PlastCare USA 100 4-Ply ASTM Level 3 Face Masks, Disposable (Blue) (2 Boxes of 5
ASTM LEVEL 3 TESTED BY NELSON LABS: PlastCare USA’s Level 3 Guardian masks are tested by Nelson Labs in the United States. 4-PLY : PlastCare USA’s Level 3 Guardian masks are made of not 3 layers but 4 layers!