Double-sided polyester canopy spans a 15.4-ft wide frame to shade a long patio table or grouped seating from overhead sun. A steel pole and metal ribs support the fabric, and the 1.9-in diameter pole fits many weighted bases to help stabilize the umbrella in outdoor areas. The hand-crank system on the center pole opens and closes the canopy so you can adjust coverage as the sun moves. Top vents at the canopy peak allow rising warm air to escape and encourage breeze flow under the umbrella for added comfort.