Want to stay streamlined and fast on every ride? Then slip into the Castelli GPM Jersey. It's named after the Gran Premio delle Montagna, or the Italian King of the Mountains, and blends classic styling with the industry's most advanced technologies. Dual-layer Stratus fabric actively moves moisture away from your skin while the ProSecco treatment keeps you dryer and more comfortable than ever before. Form-fitted design gives a second-skin fit and full zip maximizes cooling. Microfiber trim, seamless details and four convenient pockets round out this highly technical piece. Exclusively available at Performance Bicycle.