The Porter Case Computer Sleeves are sewn with a black outer covering of 1400 denier nylon, a skin diver wet suit style neoprene protective interior and a 2-inch webbed end security strap with a logo and adjustable Velcro. This light weight sleeve offers added protection insurance for those times when you need to throw your notebook into your brief case or suitcase. It comes in three sizes to fit a variety of equipment needs.