Samsonite Nobscot 5 Piece Luggage Set Black 1200D 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. Add-a-Bag Strap - Allows you to carry two bags at once by securing another bag to the top carry handle of your luggage with a clip-on strap. Inline skate wheels - Are constructed of polyurethane with ball bearings to minimize frictional resistance, offer durability and reduced resistance for smooth rolling. Smart Sleeve - Feature allows case to slide over the Upright handle tube for easy transport. Free Shipping on All Orders from Samsonite.