There are very few items in our closet that are as versatile as the Castelli Trail Jersey. We seem to reach for it no matter where or what we'll be riding, and that's because of its unique combination of performance and comfort. The polyester fleece is stretchy and cozy while maintaining a sleek silhouette that allows us to perform at our highest level. The full zip allows us to disperse heat on long climbs and zip all the way up to block the wind on fast, steep descents