A garment structure for making a base layer or midlayer jersey for sporting activities that includes a first tubular element that corresponds to both the front and the rear zone of the torso and a second tubular element that affects arms, shoulders and part of the torso in which both the first element and the second are obtained with circular machines making a knitted fabric that provides different processing that enable functional and structural features to be given to the knitted fabric and to the garment. In particular, the first tubular element has a cylindrical conformation with a lower edge that bounds the length of the jersey and an upper end divided into a pair of profiles: a first profile defined, laterally, by the line of the sides and a second profile that leads away from the line of the sides continuing the first profile with a trapezium configuration.