Coolibar UPF 50+ 42'' Titanium Travel Umbrella - Sun Protective (One Size- Silver/Green) UPF 50+ - protects against 98% of UVA and UVB rays Generous 42 inch arc, 38 1/2 inch diameter with patented double-canopy design with mesh insert for optimum ventilation and stability Ergonomically designed soft grip handle with push button auto-open and auto-close feature Measures 20 inches fully extended, collapses to 11 inches; weighs 14 oz.; Color coordinated sheath Corrosion-resistant fiberglass ribs and spreaders, water repellent durable fabric; The outside reflects UV rays while the underside absorbs UV rays bounced from ground surfaces