Fiberbuilt Umbrellas use fiberglass Ribs that give commercial strength. Fiberbuilt Umbrellas are wind tested and the best umbrella for use in a commercial environment. We are one of the original Fiberbuilt distributors and have sold these umbrellas for years. Customer satisfaction is five stars for durability and appearance. Fiberbuilt was the first company that actually placed a warranty on their umbrellas due to the phenomenal ability of these umbrellas to last in windy conditions. We like that because our customers are satisfied and happy with this purchase. "Flexibility is our Greatest Strength" is not just a saying, its the truth about this product.