The endura mtr windproof short sleeve cycling jersey is perfect for those days on the trails when you need airflow on the warm ascents but need protection against cold winds this endura mtr jersey is made from high stretch fine denier with a lightweight windproof front which makes it comfortable felxible and breathable but will stop the windchill if you wear an hydration pack on your mountain bike this windproof cycling jersey is great as the rapid wick back panel will keep you dry under yo