It seems like the umbrella you've described has several notable features that make it a practical and versatile accessory. Here's a breakdown:

1. Ultra-Lightweight and Compact:

   Weighing only 4 oz, this mini umbrella is one of the lightest on the market. Its compact size allows for easy carrying in a backpack, purse, car, or even a jacket pocket.

2. Water-Resistant & Anti-UV:

   Constructed with water-resistant 210T pongee fabric and a black anti-UV rubber layer, the umbrella effectively resists rain, sleet, snow, wind, and ultraviolet radiation. The strong shaft and aluminum alloy frame contribute to its durability.

3. UPF 50+ Sun Protection:

   The ultra-thin 30D pongee fabric with an extra UV coating provides UPF 50+ protection, blocking 99% of UV rays. This feature makes it suitable for both sunny and rainy days.

4. Ideal for Unexpected Showers:

   The light and compact design make it perfect for carrying with you, especially for unexpected rain showers. It's recommended for individuals who may need to tuck an umbrella into a backpack for quick access.

5. Windproof Design:

   The black umbrella features a double-vented canopy design, enhancing its resistance against inversion and strong gusts. This design ensures that you stay dry and protected in various weather conditions.

This umbrella seems to be well-suited for individuals seeking a lightweight, compact, and versatile solution for both rain and sun protection. Its combination of water resistance, UV protection, and windproof features make it an ideal companion for various weather conditions.