If youre looking to run like a river without the chill, then look to Mountain Hardwears Womens Stretchdown Light Pullover. Its durable design allows for a full range of movement outdoors while retaining heat thanks to lofty goose down insulation. This means its lightweight and compressible. Throw it on as a jacket in the spring or as a mid-layer in the winter. Either way, you get the stretch to keep moving.