Halley is made with technical fabric, making it a perfect layering piece or a stand-alone top. The fabric is breathable and quick drying to help prevent sweat build up, waterproof to keep you dry during rain, thermal to keep you warm, UV protected to keep the skin safe from harmful sunrays, and built with plenty of stretch so you can feel comfortable and move with ease. Halley is designed with a slim, athletic fit and features quarter zip closure for adjustable coverage.