Designer Dougan Clarke, a skilled sailor who is well-versed in sails, rigging, and boat design, knows what will stand up to the elements. He tests Tuuci umbrellas' canopies and engineering in two wind tunnels at their Miami headquarters. Bay Master Fiber Flex is aptly named for its flexible fiberglass struts, which absorb the most punishing conditions. It’s easy to use and maintain and is constructed of replaceable marine-grade components to ensure a lifetime of serviceability. Its cam cleat and pulley system lets you raise and lower the shade with ease. As with other shades, keep these in closed position during storms and when not in use. DWR is not responsible for accidents or damage caused by misuse or weather. Please note: Crazing lines may appear on the canopy fabric when it is first installed. Crazing is natural, due to the finishing of the fabric and does not affect the performance or characteristics of Sunbrella® or other solution-dyed acrylic fabrics. The fabric remains water repellent as well as stain- and mildew-resistant — and the lines will diminish over time with exposure to the elements.