PTFE is short for polytetrafluoroethylene, a synthetic fluoropolymer rather than a conventional natural fibre. Sewport describes its water-repelling character and the development of expanded PTFE, or ePTFE. Those names often appear in discussions of protective membranes and outdoor clothing, where the polymer performs a different role from the surrounding woven cloth.

Distinguish a PTFE Membrane From the Fabric Around It

When identifying a material, separate the membrane name from the garment's full construction. A reference to PTFE does not reveal every fibre in the outer fabric or lining. The finished product's specifications are needed to understand that layered combination.