Foundation layer & moisture management
The Smartwool Merino 250 Base Layer Crew is a staple in patrol lockers because it simply works. Whether it's the 100% Merino Wool or the reliability of the Interlock Knit, this gear has proven itself in the harshest environments. We found that it consistently outperformed cheaper alternatives in durability and thermal regulation.
In our testing, the key advantage was its ability to handle transitions. You don't overheat when working hard, and you don't freeze when standing still. It's an investment, but for all-day comfort, it's worth every penny. For those interested in popular gear, check out what Outside readers bought in 2025.
Why we like it
- Proven durability in professional use.
- Excellent thermal regulation properties.
- Comfortable fit for all-day wear.
Keep in mind
- Premium price point reflects quality.
- Sizing can run athletic; check charts.






