If the forecast says things are getting cold, then we're getting our Smartwool Merino 250 Baselayer bottom. As Smartwool's heaviest knit, it provides us the soft comfort we love and the breathable warmth we'll need while making our way to any summit. No need to worry about that sweaty, smelly feel on the way home either: merino wool wicks away moisture and helps reduce foul odors so we're always feeling fresh.