Size of the umbrella canopy when opened. Most folding umbrellas can open to between 42 and 44 inches, which provides excellent coverage. Also there are some person like the tiny, the following umbrella open only 34 inches.
Get an umbrella that is weatherproof and windproof, meaning it won't rust and won't turn inside out in high winds. Aluminium and fiberglass is the excellent material to made umbrella frame.When choose umbrella to review the frame is important.