The Patagonia Men's Capilene Air Medium Light Blue Quarter Zip Base Layer Long Sleeve is a stylish and functional activewear top designed for men. Made from a blend of polyester and wool, this knit fabric offers a comfortable fit with a regular size M. The pullover style and hoodie neckline make it easy to put on and take off, while the solid blue color adds a pop of color to any outfit. Perfect for outdoor activities, this base layer provides warmth and breathability for all-day comfort. There is some piling on the front. No big deal if you are using this as a base layer.