Castelli have done a lot of work making the best lightweight and ventilated jersey for worldtour racing so they turned their attention to using some of that technology to make an extremely lightweight jersey for everyday use the castelli rs superleggera short sleeve jersey theyve added a key pocket gripper elastic around the waist and protection from the zip at the top little details that arent essential for pro racing but are nice when youre on your own tour de wherever epic challenge