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The Castelli Gabba RoS Jersey is back and better than ever in its 5th generation model, providing us with excellent water resistance, breathability, and comfort. Whether we seek protection on a rainy spring day or a little extra warmth on a brisk fall morning, we pull this short-sleeve jersey on to keep our body dry and our core warm. Its front-facing GORE-TEX INFINIUM WINDSTOPPER 205 Warm fabric blocks out water, while the rear-facing GORE-TEX INFINIUM WINDSTOPPER 203 Stretch fabric adds stretch and breathability.