Our year-round Merino 150 Base Layer Tank is up to any challenge-thanks to the body-temperature-regulating properties and breathability of Merino. With our Core Spun technology, we've wrapped Merino around a nylon core for added durability while still keeping the comfort of ultra-soft, responsibly sourced Merino next to skin. Smooth merrow stitching wraps from side to front for a feminine look. Now you're ready to conquer the day.