The High Line Nanofiber Masks are made of 3 layers of material, the two outer layers are made from hemp/organic cotton with a nanofiber filter inbetween. Hemp is naturally wicking, antibacterial, antimicrobial and durable. Hemp is three times more durable than cotton, and is a boost to the environment. Liberty's hemp is knit under solar power and 100% biodegradable.
Studies have shown that a nanofiber filter can block everyday dangers such as pollution, viruses and bacteria. The tough threading of the nanofiber material is an added layer of protection.This filtration system is 99% effective. Nanofiber filter remains effective for approximately 30 washes. These masks are not medical grade.