American Tourister Have A Ball Spinner Boarding Bag (17", Black/Orange) 600D Poly/Nylon - Combination of Polyester and Nylon fabrics for durability. Nylon is a high strength, durable material with excellent wear properties. The term " denier" (D) refers to the size of the yarn used: the larger the denier the bigger the yarn. Spherical Spinner Wheels - Four, multi-directional spinner wheels for easy mobility. Retractable handle - Provides easy maneuverability when extended out from the case, and stores neatly inside when not in use. Locks in place in both the fully extended and stored positions for secure traveling. Top carry handle - Allows you to lift the case with ease and comfort, or carry it by hand when rolling isn't an option. Cross straps - Secure the contents of your luggage to help prevent shifting that can cause damage. They also help keep the contents of your luggage organized.