Windproof, Waterproof, UV Resistant, Automatic Opening, and Closing The collapsible rain umbrella is made of 10 sturdy aluminum reinforced ribs to make the umbrella stand stronger. The fiberglass tailbone is stronger and windproof and is not easy to be flipped and damaged. The handle of the folding umbrella is composed of ABS plastic handle and umbrella rope. It's 2.6 inches long (The dimensional error measured is 2%.) and suitable for adults. Oversized Canopy, Compact, Portable, Lightweight: This backpack travel umbrella has a 45.6-inch oversized canopy and is able to protect at least 2 people, but its folding size is only 11.8 inches. Rustproof, High Quality, Perfect Gift: The middle bone of this automatic umbrella is made of aluminum, and the best auto umbrella stand is made of fiberglass. These are good rust-preventive materials. They come in Blue, Black or Red