Don39t over engineer it just make it right that was the goal of the castelli product team in making the new entrata jersey start with a great fabric one that looks good and keeps you dry and comfortable then use a lightweight and very stretchy mesh on the side panels for extra give and in the shoulders for great fit whether youre standing or in an aero tuck get all the details right like the easy sliding ykk174 vislon zipper and reflective trim at the hem for visibility colours ar