3PLY SURGICAL STERILE MASK TYPE IIR PACK OF 10 MEDICAL MASK CERTIFICATES AVAILABLE ON REQUEST A good quality surgical mask generally has a three-ply layer with the innermost layer used for absorbing moisture, the middle layer is a filter and outermost layer repels water. Surgical masks are made from fabric or polypropylene and should have a minimum of 95 percent bacteria filtration efficiency. 3 Ply Mask Generally has a Three-Ply Layer with the Innermost Layer Used for Absorbing Moisture, the Middle Layer is a Filter and Outermost Layer Repels Water. 3 Ply Mask can also Protect you When Others Around you are Sick. You Should Always Wear the Mask With the Pleated Side Facing Out.