Shadow unique base construction is stronger and lighter then a conventional cargo box. It cuts through the wind with sleek aerodynamics, stealth like designs that produces better MPG. Shadow also includes the new memory mount systems for easy installation. - Stiffer base for stability - Dual side opening for easy loading - Ample 14 cubic foot capacity - Universal Mounting System - Mounts to square, round, and most factory crossbars - User friendly locking mechanism for single handed opening - Includes keys & locks