Mack Weldon AIRKNITˣ Boxer Brief vs Smartwool Active Merino Boxer Brief

Buy the AIRKNITˣ for hot weather, workouts and everyday wear where you want the lightest, most breathable feel. Buy the Smartwool Active Merino for cold-weather base layers, travel and multi-day wear, where merino's temperature regulation and odor resistance matter more than weight. The AIRKNITˣ has far more owner feedback and a flyless pouch; the Smartwool is a slimmer, wool-rich brief with flatlock seams and no fly. Reviewers rate the Smartwool's fabric and stitching highly, but its rating rests on far fewer reviews.

• Choose the AIRKNITˣ Boxer Brief if you run hot, train often or want an ultra-light brief that stays dry and barely feels like anything.
• Choose the Smartwool Active Merino if you want a merino-blend base layer for cold days, travel or long outdoor days with less odor buildup.