There is no greater natural fiber for four-season comfort than merino wool. Its unrivaled ability to absorb and wick away moisture (and still smell good) offers a cooling effect in the summer and a warming effect in the winter for second-to-none comfort while riding. Our range of fall/winter weight base layers utilize merino-based fabrics, sourced from ultrafine merino but cut in a more relaxed fit for added comfort and easy layering. At 160gsm, this mid-weight base layer adds warmth without bulk for shoulder season through mid-winter riding when worn beneath our long sleeve jerseys and jackets. Or it can act as a stand-alone layer dressed up for any casual Friday (or as we call them, Friday.) Enjoy anti-bacterial, odor-resistant, and thermoregulating goodness in this natural fiber top.