- Athletic fit
- Super-soft fabric
- Powered by 37.5® technology, which helps warm you up when you’re cold and cool you down when you’re hot
- 34% 37.5® post-consumer recycled Polyester, 52% post-consumer recycled Polyester, 7% Wool, 7% Elastane
- Reflective "4" logo on back
Our most technical tee, the Level is engineered to perform in the toughest conditions and still look good enough to wear to brunch. Runner’s World named it the ultimate year-round running top, and it’s a great pick for any high-intensity workout where controlling your body temperature is key. The secret 37.5® technology, which uses active particles to vent heat in warm conditions and retain heat if it’s cold. One of our best sellers, the tech in this shirt is proven to help athletes perform better.