With its highly elastic wool blend, the ASSOS Ultraz Winter Long Sleeve Skin LayeR provides body-mapping insulation to keep us warm as we pedal through the winter. By blending Merino wool and synthetic materials, ASSOS created a stretchy, thermoregulating construction with a next-to-skin fit that traps warmth and expels moisture to keep us at the perfect temperature during our high-output winter rides. This baselayer also features an ultra-high collar for added coverage and neck protection, while odorControl Ultraz provides significant odor protection to keep us fresh during and after even our biggest efforts.