Mephisto - Zulma (Black Lycra) - Women's: The Zulma knee-high boots are made with Lyrcra(R) uppers for a flexible and cozy fit. Gore-Tex(R) technology gives you breathable, waterproof protection to keep you dry and comfortable. Full inner side zip allows for easy wear. Cushioned footbed with tiny air channels deep inside the sole give you Air Jet technology. This circulates the air inside the shoe while you walk. Natural rubber outsole gives you the ultimate in flexible and lightweight support. Shock absorber heel reduces harsh impacts from walking. Sacchetto construction gives you added forefoot flexibility and comfort.