Whispbar S-Wing Roof Bars - Loads Better! Whispbar S-Wing is the ultimate roof rack solution. For those who are looking for the factory look to those wanting to carry more gear. Whispbar S-Wing has you covered. Super Adaptable' Whispbar S-Wing roof racks are super adaptable. The innovative Smartfoot system adapts and transfers simply to virtually any vehicle, making it easy and inexpensive to transfer your existing crossbars to a different car.