Rio Beach Clamp-on Umbrellas come in all shapes and sizes. With lab tested Sun Protection Factors from SPF35 to Total Sunblock. These umbrellas are designed in fashion colors and patterns to match the chairs. Rio Beach Umbrellas are endorsed by the American Skin Cancer Foundation, the only umbrellas to earn that designation. Sunscreening clamp-on umbrella 4' diameder SPF 50 sun protection factor. Tilt feature Multi-position Rugged 75D polyster fabric. Zinc plated pole and ribs. Clamps to a vertical or horizontal surface.