Castelli Do. Di. Ci. Short Sleeve Jacket The Gabba's Breathability. None of the Compromise. Ristretto technology is the whole story here. Where the Gabba trades breathability for water protection, the Do. Di. Ci. flips that priority entirely: the ITTTAI(R) membrane restricts airflow just enough to block wind, but lets through 12 times more air than the original Gabba. That controlled permeability pulls sweat away from your skin instead of trapping it, so you stay drier at race pace than you ever could in a traditional shell. The stretch fabric moves with you through the whole range of motion on the bike, and the close race fit layers cleanly over a base without adding bulk. This is the jacket for cool, dry mornings when a vest isn't enough and a full jacket is too much. Castelli Ristretto Technology engineered air permeability blocks most wind while allowing just enough airflow through to evaporate sweat 12x more effectively than the original Gabba ITTTAI(R) Membrane Construction PFAS-free membrane and lamination process delivers advanced stretch, breathability, and light road-spray resistance in a single fabric layer YKK(R) Vislon(R) Full-Length Zipper smooth, snag-free operation lets you dial ventilation on the fly without fighting the zip mid-effort Three Rear Pockets with Reflective Piping keep your kit organized and add low-light visibility without disrupting the clean silhouette | Castelli | Do. di. ci. Short Sleeve Jacket Men's | Size Extra Large In Light Black