Smartwool Men's Intraknit Thermal Merino Base Layer Bottom vs Minus33 Midweight Merino Wool Bottom

The Smartwool Intraknit is the better pick for high-output cold-weather activity. Its merino-polyester blend and knit-in mesh venting move sweat and dry faster, and the slim fit layers cleanly under ski and climbing pants. The Minus33 706 is the warmer, more durable-feeling option for standing around in serious cold, and its 100% merino, 18.5-micron interlock knit is softer against skin and easier to care for. Owners of both praise warmth and odor resistance; the Smartwool draws more comments on fit and breathability, the Minus33 on warmth and value per layer.

• Choose the Smartwool Intraknit if you run hot, ski or climb hard, and want a slim, ventilated bottom that manages sweat under a shell.
• Choose the Minus33 706 if you want maximum warmth for low-output cold, prefer pure merino next to skin, and want machine wash and dry simplicity.