Don't even think about forcing the Smartwool Anchor Line Shirt Jacket to stay inside, unless you're in the city in August. But mid-July in the mountains? Fair game. Essentially, the Anchor Line just wants to be outside, and its merino and nylon blend will help regulate your temperature whether you're chopping wood in October or heading out for a hike on a mild late winter day. Though it looks like a classic flannel, the Anchor Line has the thickness of a shirt jacket, so pair it with a baselayer and its warmth may surprise you.