Beautiful patio umbrellas add protection from weather and sun while adding charm and color in the backyard. You can move them around and follow the sun for the maximum protection. It adds a sense of focus especially over a dining table. They come in various sizes 6'-8+'based on the widest dimension of the open canopy. Their shapes include square, round, rectangular, hexagon and octagon. They are commonly manual crank type but can be electric operated with remote control for the larger heavier ones. Remember to securely anchor the post in a heavy base with a set screw . Special offset umbrellas are also available when you want the post outside the shaded area and more mobility for sun following.