This personal umbrella is 58" diameter and offers sun protection of UPF 50+ which blocks 98% of UVA/UVB. Tilt feature. Multi position. Rugged 75D polyester fabric. Zinc-plated pole and ribs. Steel reinforced poly clamp. Clamps onto a vertical or horizontal surface. It easily fastens to the back of your chair or armrest, and adjusts to all angles to follow the sun throughout the day. Solid colors of lime green, turquoise, and medium blue -cannot specify color. Recommended by the Skin Cancer Foundation. 8 ribs. Open Dims: 48" x 48" x 34.25". Closed Dims: 2.5" x 1.75" x 34.25".