When you're limited on pack space, grab Smartwool's Men's Merino Sport Ultra Light Hoodie. It's easy to pack down, but tough to defeat. Made with body-mapped panels of Merino Sport 150 mesh designed to help enhance breathability and temperature regulation, a DWR coating for wind and weather protection, and super-light recycled nylon outer shell fabric, Smartwool's Men's Merino Sport Ultra Light Hoodie is the perfect layer for whatever Mother Nature throws your way.