Incorporates proprietary filtration media and rayon outer layer. Features popular duckbill design. Provides off-the-face comfort and unmuffled speech. Unique filter combination reduces fogging. Has a lower delta P a measurement sought by clinicians performing longer surgical procedures. Crosstex Procedural Earloop Face Masks have both an inner and outer fluid resistant layer. These masks have high breathability with a PFE that exceeds 99 at 1.0 micron.. Color - Blue.. 50 per box.