Burgendy Coif Mask One size fits all 
Filter Mask Material is contructed with a portion of a polypropylene spunbond nonwoven with a Nanofiber fine fitration layer and surface layer of polyester nonwoven. The Nanofiber filter helps protect you.
This filter nano material far exceeds standard cloth and fabric materials in efficiency percentage.
3-Layer lightweight composite filter media
Polyester/Cotton Sewing Fabric Microfiber 
 filter for Mask Material.
2.50% 2.50% 9.30%
10.40% 14.50% 95.00%