Abstract: A structure comprising a supporting pole (1), a plurality of ribs (21) converging onto said pole, a covering canvas (4), fastened on said ribs, means apt to move said canvas (4) from the closed state to the open state and viceversa, a rope or stay rod (6) destined to bend upwards one of the ribs, as well as a jib (9) fastened to the canvas (4) at the position of the rib (21) apt to bend and to the activation rope (6), with said jib (9), when stretched, destined to act as orienting rudder of the covering, so that in presence of wind the umbrella orients and the upward folding of a covering portion, at the inflected rib, allows the continuous exhaust of the air which is pushed by the wind under the covering itself.