The castelli entrata 2 fz short sleeve 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 yoursquore standing or in an aero tuck get all the details right like the easy sliding ykk vislon zipper and reflective trim at the hem for visibility we kept the colors clean to make this the jersey that will see a lot of use throu