3379 ML Pull Men — seamless under mid-layers. Mammut® Phase Weave™ seamlessly integrates and combines extremely different material properties and processing methods into a single material. This provides not only an aesthetic look but above all a high level of comfort. Temperature-regulating Merino wool meets the strengths of high-performance Polycolon fiber. The wool blend impresses with good heat regulation and breathability, even when wet. A mid-layer worth wearing.