Castelli Fedele Jersey
The Castelli Fedele is unusual in that it's thicker and warmer than most short-sleeve jerseys which makes it a useful option for spring, autumn and cool summer morning/evening rides.
The Fedele is made from Castelli's Thermoflex Lite fabric which is a brush-backed polyester. It's a mid-weight fabric, not far off the kind of thickness that you sometimes find on long-sleeve winter jerseys. It's in no way windproof – it's not that dense – but it's thick enough to provide considerably more insulation than a standard summer jersey.