What activities is it suitable for? Ski Technology & Gadgets PTX MEMBRANE (BOOTS) PTX is a modern membrane material used in the production of outdoor footwear. It is characterized by its vapor permeability, waterproofness and wind resistance. This ensures thermal insulation and comfort in all weather conditions. PTX wicks body moisture to the surface, preventing it from accumulating. Its outer layer also prevents the penetration of water, snow, wind and dries quickly. The material is very light and comfortable in all conditions.