If your midlayer's stuffier than a lecture on medieval economics and weighs as much your whole kit combined, then you might want to grab the Salomon Agile 1/2-Zip Mid Shirt. This lightweight and breathable piece was designed for comfortable, temperature-regulating warmth while you move, and you'll love layering it up for winter hikes as much as you do rocking it alone for cool runs in the fall and spring. AdvancedSkin Warm fabric keeps you warm but doesn't overheat, and boasts an integrated stretch that'll help you move how you need to through any season or activity.
This breathable midlayer boasts versatile multi-season performance
Temperature-regulating fabric keeps you comfortable as you move
Stretchy construction won't limit your movement
Reflective accent and treatment help them see you in low light