The Yakima Whispbar Through Bar Rack Kit lets you utilize every precious inch of the crossbars to carry all the gear you'll need for a weekend on the trails or out in the snow. As an added bonus, the crossbars' aerofoil shape looks a bit like an airplane wing and cuts smoothly through the air for a quiet and energy efficient ride. The Whispbar Through Bar Rack Kit comes in two kit options. The full kit includes two crossbars, four towers with SKS locks, and four SmartFoot mounts with cushioning pads. The half kit comes with one crossbar, two towers with SKS locks, and two SmartFoot mounts with cushioning pads.