An ultra-lightweight merino base layer top that helps regulate body climate during high-movement activity, the 125 ZoneKnit short sleeve shirt is made from our Cool-Lite Jersey and is ideal for demanding adventures and daily training. Cool-liteCool-lite combines merino with TENCEL a natural fiber sourced from sustainable eucalyptus, that helps heat dumping and wicking to enhance cooling in the heat of the day. The merino component resists odor, breathes and regulates temperature when it turns cooler.