Optimised for use in a peloton, the MET Trenta's tubular tail and internal ventilation ducts provide 7% less drag compared to a traditional design, for best performance in group rides. The NACA vent and rear deflectors provide a sophisticated flow of air inside the helmet, efficiently cooling your head without slowing you down. Especially since only 30% of the helmet is resting on your head - temperature control at the highest level.