RENSA Clearcare Ultra™ ASTM Lever 3 Surgical Face Masks provides daily maximum fluid resistance protection at ultimate comfort. Made with premium-quality and breathable materials, triple-layered and polypropylene ear straps for comfort, filtration and protection. The PPE face masks are tested to ASTM standards by Nelson Labs, the only U.S.-based laboratory testing face mask to ASTM standards. ASTM International standards are the world's leading technical standards for fluid resistance, filtration and requirements for comfort and breathability. Available Quantities: