When the temperature drops and you need to stay warm and dry out on the trails, grab Bjorn DaehlieA;&&';;s Training Will Half Zip. This 60% merino wool / 40% polyester base layer is comfortable and breathable against the skin. YouA;&&';;ll appreciate the half-zip for maximum body-temp control. Merino wool blend Mesh ventilation Regular fit Bjorn Daehlie Women&';s Apparel XS S M L XL Height