Step2 40 inch Wavy Umbrella Designed to provide protection from the sun and the damaging effects of ultraviolet rays. Has a UPF (Ultraviolet Protection Factor) rating of 40+ which means it blocks up to 97% of UVA and UVB rays. It has six strong resilient support ribs that absorb the wind without breaking It adjusts to heights between 32.5" and 51.5" (82.6 and 130.8 cm). Features an easy push up opening and closing by an adult is recommended and minimal adult assembly is required.