Fits 9ft 8 ribs umbrella frame. Each rib must measure 52" to 54", please measure your umbrella rib length before purchase. For essential wind and heat ventilation, we have included a single wind vent in the production of this umbrella canopy. With a wind vent, you can ensure that the wind and heat in and around your umbrella will be maintained, causing the product to remain stable and grounded. Universal canopy fits 9ft 8 ribs patio umbrellas (Including Aluminum, Wooden and Fiberglass) 180g UV Protective polyester fabric If you have any problems, please feel free to contact us. We will reply you as soon as possible in 24 hours from Monday to Friday.