Conquer cold weather with ease choosing the Smartwool® Intraknit™ Thermal Merino Base Layer 1/4 Zip. Engineered with Intraknit technology, this base layer seamlessly combines insulation, articulation, and ventilation for ultimate comfort and mobility. The seamless knit mesh ventilation and 3D mapping provide a near custom fit, allowing you to move with freedom and ease. And with the convenient center-front quarter-length zipper on the mock neckline, you can easily regulate your temperature during any activity.