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Castelli has designed the GPM Sleeveless FZ Cycling Jersey to be your favorite. REINVENTING A CLASSIC.GPM is the acronym for Gran Premio delle Montagne, or the italian king of the Mountains. And while this isn�t our lightest jersey, it combines light weight with the innovative comfort of seamless arm and neck bands, a feature developed initially in our seamless base layers. A classic look, reinvented with the latest technology
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