Whether our trek leads us to the brightest views of the changing leaves or the perfect point to drop our skis into powder, the Polartec Power Grid Half-Zip Jacket is our choice midlayer. Not only is this fleece made from recycled materials, reducing waste and energy consumption in the production process, but it's also designed in such a way that both breathability and thermal performance take priority. The grid knit creates air channels so more air can pass through without losing heat on the way out.