Putting on the Castelli Free AR 4. 1 Men's Jersey won't be enough to win you a spot on the podium of your next race all by itself, but it might help, depending on how hard your legs want to work. Formerly a pared down racing jersey, the Free AR 4. 1 retains its competition pedigree with a few extras added this year to make it a more versatile training jersey too. Castelli employs its most streamlined fit for the Free AR, stitching Velocity fabric into a contoured, flexible design that will move with you through the rigors of a race, reducing drag by ushering air over its dimpled surface without feeling restrictive or tight. Added touches like ventilated Nervato underarm panels and soft raw edge arm grippers lend the Free AR more watts saving style and long term comfort this year, and other details like a neck saving zipper flap and four rear pockets, three open and one zippered, make this a piece you shouldn't hesitate to throw on before a pre race taper ride or mid season training day with your ride group.