Made with 100% merino wool, this short-sleeved base-layer top provides natural, breathable warmth for biking, running or hiking. The ultrafine yarn means it's nice and soft for next-to-skin wearing comfort. And antimicrobial merino wool makes for easy, gentle washing so you can reach for this top again and again. With its heat-regulating properties, this t-shirt is ideal for layering under waterproof outerwear on rainy mountain-biking tours. And on warmer days, it's great to wear it on its own. The Merino Concept T-shirt for women gives you a casual layer of breathable warmth for riding loam or hitting the trails.