The Castelli Gabba R Jacket combines aerodynamics and weather protection in this wind tunnel-tested jacket. The Castelli-exclusive fabric blocks the wind and water from our bodies and features a microporous electro-spun hydrophobic polyurethane membrane that helps keep things breathable. A polyester/elastane inner fabric backer increases comfort and adds perfect stretch to keep us moving freely in the saddle, while the drop tail design with a reflective stripe provides added protection against road spray and increases visibility in low-light situations.