Sunrise to sundown, from epic approaches to alpine traverses, the versatile R1® Pullover stretches, breathes, moves moisture and insulates. And it is the best it has ever been: We collaborated with Polartec® to fine-tune the high/low interior grid polyester fabric (Polartec Power Dry®) into an exclusive that's more breathable and compressible and has an improved feel and increased durability, while still maintaining its warmth. Sized to accommodate light underlayers, it works as a stand-alone top or as a light midlayer. Its smooth, microfiber face speeds wicking and glides under other layers, and its racerback seam design increases flexibility and comfort under a pack.