What sets a Puraka Mask apart from an everyday face covering? Just about everything. All Puraka Masks feature a sturdy nose clip, under-chin extension, adjustable ear straps, three-layered cotton shell, and filter pockets.* Puraka's Universal Masks contain a breathable layer of electrostatic batting, while our Essential and Breathe Masks incorporate our trademark, a protective polypropylene moisture barrier, while also meeting ASTM F3502, the CDC-recognized standard for reusable fabric masks. Breathe easy.