NWOT. Warms when it's cool, breathes when it's warm. Our pullover has all the performance features you need for weightless comfort with a flattering funnelneck for extra warmth and coverage. Light as air and surprisingly warm, we designed this ultralight layer with a thin, low-profile baffle construction that actively increases thermal efficiency. That means you stay warm when the temperatures drop, but dry and comfortable during high-intensity activities. 100% polyester. UPF 50+ fabric blocks at least 97.5% of the sun's UV rays — 10x more than a white cotton tee. Stay-dry performance wicks moisture and dries fast. Abrasion-resistant fabric withstands wear and tear. Bluesign® approved fabric helps offset impact on the environment. Machine wash and dry.