Whether you're on a training ride or suiting up for race day, the Castelli Perfetto Vest is the lightweight layer that will defend your core from the elements so your muscles can do their job. Gore Windstopper X-Lite Plus material protects your chest and shoulders from wind and moisture, helping you retain body heat even when you're flying through a fast descent in windy conditions. Nano Flex Light makes the back of the Perfetto extremely breathable for ventilation as you pedal while also giving it the ability to repel the water that comes off your back wheel. The high collar and drop-tail hem provide plenty of coverage for your on-bike position, while the full-zip, form-fitting design is easy to layer and adjust mid-ride.