- 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 provide top performance through the toughest conditions (and it makes great travel wear, according to Men’s Journal). The secret 37.5® technology, which uses active particles to vent heat in warm conditions and retain it if it’s cold. This tech is proven to increase your body’s efficiency by up to 26% at lactate threshold, so you can push yourself further than you’ve ever gone before. Named the Best Lightweight Layer by Runner's World, the Level lets you focus on your performance.