The main fabric on the body is a polyester blend with a little Lycra® for a perfect fit and excellent breathability control. It is based on the same Velocity Rev3 fabric we use in our Aero Race Jersey, but we put 20% more to ensure excellent performance but in a more versatile garment and to better support your pockets. We use a 3D mesh fabric along the shoulders, plus a flat mesh on the side panels. The pockets are a little wider than the running jerseys to be more roomy and there is a zipper pocket for keys and money.