The dome-shaped roof was built over an already existing bullring.
The one-layer fixed roof is a Schwelder-type dome composed of IPC commercial steel profiles (parallels, meridians and diagonals) of 1/8 sag-span ratio. At its inner perimeter, it is supported by steel pillars.
The moveable roof-part consists of two semi-spheroidal segments, both of which rest on three beam rails set on the fixed roof and rolling on them in order to allow the opening of the roof.
The open-close system of the roof is put into action by means of a cable winch transferring the necessary pull for the timed movement of the segments.