Even on sub-freezing days, we're out to break a sweat, and we work out in the Intraknit Merino 200 1/4-Zip Top. This action-oriented baselayer top uses lightweight materials and 3D knitting for an athletic fit and improved range of motion. A sporty blend of merino wool and polyester combines quick-drying capabilities with ultra-soft odor-fighting powers, letting us stay on the track for longer.