Everything castelli does is somehow designed to make you faster think of this castelli espresso 4 softshell jacket as your go fast in july jacket they didnt make it aero so its not going to help you wind the club training rides in january what castelli did is include every creature comfort to help you get in as much training as you can stand over the winter its cut a little looser than their race pieces the full gore windstopper construction seals out the cold while offering the best av