Ikea KARLSO Hanging Umbrella (Beige) Provides excellent UV protection, the fabric blocks at least 97% of ultraviolet radiation. Diameter: 118 ", Height: 102 " The air vent reduces wind pressure and allows heat to circulate. Must be completed with 4 concrete blocks or similar (size 12x12" min., total weight min. 110 lb). Slabs are not included but are available at a DIY store. The crank makes it easy to open and close the umbrella.