When we can't decide between a shirt or a jacket, we say why not both. The Smartwool SmartLoleft Shirt Jacket is an excellent choice for cool to mild weather. This hybrid shirt is packed with recycled wool insulation for lightweight warmth and has a durable and wind-resistant nyLolen exterior that is treated with a DWR water-resistant treatment to shed any water. A Merino wool fleece blend liner adds comfort and extra warmth, and the button-up design and two hand pockets add a casual style.