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The Castelli Gabba R Jersey combines protection and aerodynamics to ensure we stay dry, fast, and comfortable on days when the weather isn't in our favor. This jersey features a unique construction, using a Castelli-exclusive fabric with a microporous, electro-spun, hydrophobic polyurethane membrane to keep things lightweight, breathable, and dry. Castelli built the interior with a fabric backer that features elastane and polyester for added stretch and breathability, while three rear mesh pockets keep our essentials secure with added drainage.