Thanks to the optimal blend of insulating merino wool and moisture-wicking synthetic fibers, you'll stay warm and comfortable in a variety of temperature conditions. The unique 50/50 blend offers the familiar benefits of merino wool - super soft, naturally insulating and with exceptional temperature regulation; However, it also combines it with the added durability, stretch properties and wrinkle resistance of polyester fibers. The result is that this baselayer is incredibly comfortable to wear next to the skin, but also has a long life and stands up exceptionally well to repeated wear and frequent washing - the perfect combination for winter cycling wear.