What do you get when you mix up one half excellence, one half warmth, and one half gnar? Yes, thank you mathematicians, you get way too many halves, but if you're Patagonia, you also get the Patagonia Capilene 4 Pro Zip-Neck Top. With strategically placed R1® fleece throughout the core area for warmth and Capilene 4 panels for breathability, you really can have that many halves make one whole. This math-theory-bending layer is made to perform; whether you're hitting your local hills or earning your turns, it will only do you good.