Pearl Izumi designed the Pro Mesh Jersey for high-output cycling in warm weather, and we like that it keeps us cool and comfortable throughout our ride. A combination of PRO Transfer Mesh and Pro Aero materials enhance airflow and aerodynamics where you need the most airflow around the core and aerodynamics in key leading-edge areas. Pearl Izumi's patented Speed Sleeve construction optimizes the fit in your on-bike stance, yet the Pro is built with stretchy material that allows a comfortable fit in any position. The full-length zipper locks into place, but can be easily unlocked and opened with a single hand for mid-ride ventilation.