A standard of the outdoor dining set, a patio umbrella is usually made of fabric stretched across a large collapsible frame. Vents in the top of the umbrella are a must so that rising heat can escape from underneath. These umbrellas are large enough to shade the large part of a table. A hinged shaft allows the umbrella to be tilted to ward off the moving sun. The shaft is usually fiberglass or wood and designed to fit inside a hole in the center of the patio table.
Golf umbrellas are large, about 70 inches across, and are designed to protect golfers on the course from a sudden shower. The structure, including the handle, is made of fiberglass to make them lightning resistant. The canopy is strong to prevent it from turning inside out in a wind. The handle is designed ergonomically so that gripping the umbrella in a sudden storm doesn't affect the golfer's swing afterward.
These very wide, colorful umbrellas dot the beach on a nice summer day. They are usually 6 to 9 feet wide and fold up easily to put back in the car. The end of the shaft is pointed so that it can be shoved into the sand. Some also come with a heavy base into which the shaft can be mounted so it can be used without the sand. They are made of vinyl, canvas or thick polyester for durability. New umbrellas often have an SPF (sun protection factor) rating and built-in sun protection. Good beach umbrellas are made of rust-resistant material and fabric designed for prolonged sun exposure.