When selecting an umbrella for UV protection, there are a few key factors to consider. Here are some tips to help you choose the right umbrella:

1. Look for UPF rating: Ultraviolet Protection Factor (UPF) is a measure of how effectively an umbrella blocks UV radiation. Look for umbrellas with a UPF rating of 50+ or higher. The higher the UPF rating, the better the UV protection.
2. Choose a large canopy: A larger canopy will provide more coverage and shade, protecting a larger area of your body from the sun’s harmful UV rays. Look for umbrellas with a canopy diameter of at least 42 inches or more.
3. Opt for a dark-colored canopy: Dark-colored canopies, such as black, navy blue, or deep green, tend to absorb more UV rays than lighter colors. This helps in reducing the amount of UV radiation that reaches your skin.
4. Check the fabric: Look for umbrellas made of UV-resistant fabric. Fabrics like nylon or polyester treated with UV-protective coatings offer better protection against UV rays. Avoid umbrellas made of sheer or thin materials that allow sunlight to pass through.
5. Consider a dual-purpose umbrella: Some umbrellas are designed specifically for UV protection and come with a double-layered canopy. These umbrellas not only provide shade from the sun but also block a significant amount of UV radiation.
6. Evaluate the handle and shaft: Choose an umbrella with a sturdy and durable handle and shaft. A quality construction ensures the umbrella can withstand wind and other weather conditions while providing reliable UV protection.
7. Portable and lightweight: If you plan to carry the umbrella with you regularly, consider its weight and portability. Look for compact, lightweight models that are easy to carry in your bag or backpack.
8. Open and close mechanism: Ensure the umbrella has a smooth and easy-to-use open and close mechanism. This will make it convenient to use whenever you need protection from the sun.

Remember that an umbrella should not be your sole form of sun protection. It is essential to use other sun protection methods such as wearing protective clothing, a wide-brimmed hat, and sunscreen to ensure comprehensive UV protection.