The striking white roof has rows of skylights crossing the complex, providing daylight and allowing overhead lights to be off during the daytime. It is made from a net of cables supported by the surrounding steel super structure and will deflect the summer sun during the games thus reducing the cooling needs. The roof collects rain water as well, which is stored for later use in the facility. The shape of the roof was created to reflect the geometry of the cycling track, using a very lightweight double curving cable net structure. It weighs half of the roof of the Beijing Velodrome.