Filtration efficiency is at about 99.9% and the principle of filtration is mechanical. Particles in the air are bigger than pores in nanofiber web, but oxygen particles are small enough to pass through. Nanofibers have the capabilities in oil–water separation, most particularly in sorption process when the material in use has the oleophilic and hydrophobic surfaces. These characteristic enable the nanofibers to be used as a tool to combat either oily waste- water from domestic household and industrial activities, or oily seawater due to the oil run down to the ocean from oil transportation activities and oil tank cleaning on a vessel. Sportswear textile with nanofiber membrane inside is based on the modern nanofiber technology where the core of the membrane consists of fibers with a diameter 1000× thinner than human hair. This extremely dense "sieve" with more than 2,5 billion of pores per square centimeter works much more efficiently with vapor removal and brings better level of water resistance. In the language of numbers, the nanofiber textile brings the following parameters:  ·       RET 1.0 vapor permeability and 10,000 mm water column (version preferring breathability)  ·       RET 4.8 vapor permeability and 30,000 mm water column (version preferring water resistance)  Nanofiber apparel and shoe membranes consist of polyurethane so its production is not harmful to nature. Membranes to sportswear made from nanofiber are recyclable.