Wherever our cool weather adventures take us the Mountain Hardwear Polartec High Loft Jacket keeps us warm and comfortable. The fleece jacket can be worn as a midlayer on cold fall hikes or can be worn on its own when we're camping in milder weather. Elastane stretch panels on the sides give us the freedom to hike and climb, and the full-zip style allows us to circulate air as we work up a sweat.