Thermo boots from the brand Weestep is a modern development of the membrane technology WE-TEX. The membrane can be two-layer-such a membrane is used in products with a lining, and three-layer, where the outer fabric is used, the membrane is laminated to the outer and inner fabric (lining to protect the membrane). WE-TEX membrane is made of Teflon. The main property of the material is water resistance and vapor permeability. WE-TEX membrane is a very thin fluoroplastic film and has a large number of holes.