Borrowing its cut from its big brother, the Aero Race 5. 0 jersey, the Castelli Volo Full Zip Short Sleeve Jersey is about as close to invisible to the wind as a jersey can get. The Volo is no one trick pony, however. The jersey, which is the top half of the kit by the same name, also stretches to perfectly fit your form in the saddle, and it pulls moisture from your skin to keep you dry and comfortable. All of the Volo's virtues can be attributed to two things: its cut and its materials. The cut is responsibility for the Volo's perfect fit. It's designed to snug up to your skin without binding or bunching while you're in the seated pedal position. The controlled mechanical stretch ensures this perfect fit without limiting your range of motion. The materials were chosen for their efficient moisture wicking capabilities, which move moisture away from your skin to the surface of the jersey, where it's quickly evaporated. Stretch mesh side panels keep air moving through the jersey to cool you off, and the full front zipper can be lowered to dump heat if needed.