Ballistic Airlight is a nylon that is ultra thin and ultra lightweight, yet has incredible abrasion resistance. Because each individual fiber is tightly woven to create a fine, supple fabric. In addition, the fibers are crimped to provide excellent stretch and feel comfortable against the skin.
About denier: Denier is the weight of a 9,000m long thread, and in practical terms, it is a good equivalent of thickness. A thread of 1-denier would weigh 1 gram. The lower number the denier, the thinner and more fine the thread.