- Athletic fit
- Zippered neck with reflective tape
- 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% Spandex
- Reflective tape on hem for high visibility
- Reflective "4" logo on back
Our most technical tee, now with a Half-Zip neck, 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.