PTFE
Short for polytetrafluoroethylene, this product was first
marketed as Teflon®. This non-hydrophilic laminate
gives superior waterproof performance while achieving
high breathability compared to other waterproof/breathable
coated or laminated fabric.
In a breathable, waterproof fabric the PTFE membrane is
the central component. With microscopic-sized holes, the
PTFE allows water vapor to pass through the barrier, but
blocks liquid water droplets from finding a way in.