Samsonite Pro 4 DLX Vertical Spinner Mobile Office Black 1682 Denier Nylon - 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. 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. Laptop compartment - Is a built-in padded compartment designed to carry your laptop computer and help protect it from shocks while traveling. Perfect Fit Laptop System - Adjustable laptop system (patent pending) provides a secure fit various size laptops. Free Shipping on All Orders from Samsonite.