Samsonite Bartlett 24" Spinner Luggage Black 1680D Polyester - Is a man-made fiber produced by the polymerization of the product formed when an alcohol and organic acid react. Loosely defined, denier (D) refers to the yarn size: the larger the denier, the bigger the yarn. Spinner Wheels - Four wheels...zero effort, four multidirectional spinner wheels allow 360 degree upright rolling in multiple directions so there is no weight on your arm. Retractable handle - Provides easy maneuverability when extended out from the suitcase, and stores neatly inside when not in use. Locks in place in both the fully extended and stored positions for secure traveling. Expandable - Fabric folded within a zipper compartment opens with a zip to add 2" or more carrying space to the interior of your suitcase. Because you never know when you might need more room. Free Shipping on All Orders from Samsonite.