Ease of Shade + High UV Protection. This lacquered aluminum center pole umbrella features 4 ribs, an air vent, and an easy push-up open system with an open-lock handle. The fabric of the parasol is Eco-friendly with a photo-catalytic nanotechnology that, upon contact with sunlight, turns air pollutants into inert salts. One Pure umbrella will have the same anti-pollution effect as planting 2 trees.