Engineering and design - A.Brolly Portobello is also equipped with a number of patented high-tech functionalities. Have you ever experienced walking along a crowded walkway with an umbrella? It causes you to twist and turn your umbrella constantly. Our Vortex technology allows the canopy to spin around with opposing forces so you can simply walk through without having to reposition your umbrella all the time. No more struggling to close the umbrella. Plus the self-locking shaft ensures that the umbrella would not shoot open as the self-locking shaft gently controls the closing of the umbrella for the user.