Truly complete your system with the Core Merino 220 Boxer.  Soft, midweight merino wool offers itch-free comfort you'll want to wear whether you're in the field or not, and it's naturally odor-resistant to minimize smell during extended trips into the backcountry.  Sitka's ArmorSpun merino wool is also reinforced with nylon to ensure this boxer stays in your kit for a long time.