Crosstex™ Ultra™ Sensitive Earloop Mask with Secure Fit™ Mask Technology PreviousNext Crosstex™ Ultra™ Sensitive Earloop Mask with Secure Fit™ Mask Technology GCFCXSSF-HF ASTM LEVEL 3. Extra-soft white inner cellulose layer for added comfort. Better fit and protection with Secure Fit™ Mask Technology. White, 50/box. Where to Buy x Category Dealer PartnersSales RepresentativeStrategic MarketsSchools RepresentativeAccutron™ Equipment Sales Zip Code Find RepresentativeReset Select a category, input a zip code and click on Find Representative, or explore the complete list here.