Whether you're headed out for a late fall hike or need a little extra insulation under your shell when you're hitting the resort, the Smartwool Women's Smartloft 60 Jacket delivers. Filled with Smartwool's lightest-weight insulation in critical areas, this jacket is designed for high-output activities in mild weather, and layers well under a shell or heavier jacket for versatility when the temperature drops. The water- and wind-resistant face fabric fends off light flurries and biting gusts, while stretchy merino panels at the back and sides of the jacket enhance range of motion and promote breathability to prevent you from overheating.