Umbrella canopy and method of forming same

An umbrella canopy comprising a single sheet of web material formed in a closed configuration and having a periphery of a fixed length, said single sheet of web material having a bowed configuration, said single sheet of web material having at least one tuck means, extending inwardly along at least one radially directed line of said umbrella canopy from said periphery thereof, for applying a circumferential force on said single sheet of web material to form said single sheet of web material into said bowed configuration without application of a strut force thereon, each said tuck means comprised of a first portion of said web material which extends in said radial direction being in contact with an adjacent second portion of said web material which extends in said radial direction and which is spaced apart from said first portion prior to formation of said web material into said bowed configuration, with said first and second portions of said web material being secured to each other.