An easygoing silhouette with athletic performance, this midlayer makes cool-weather training and cold-weather layering a little easier. Warm and wicking, its signature PeakWool™ blend combines the natural temperature regulation and odor control of responsibly-sourced merino wool with the softness, resilience and durability of synthetic fibers. An athletic fit and smooth flatlock seams layer comfortably under a shell or vest, made for quick shifts between up-tempo workouts, lunchtime ski laps and anything else that follows.