What Our Gearhead® Experts Are Saying: “I rely on these for high-output days when standard merino bottoms feel too warm. The zoned panels dump heat where you need it, and the fit stays snug without restricting movement. They’re comfortable under shells and don’t bunch or chafe.”Cold days with a fast pace demand baselayers that adapt as effort changes, like the Merino 200 ZoneKnit Thermal Leggings. icebreaker focuses on performance here, pairing natural merino warmth with targeted breathability for movement-driven days. The midweight 100% merino construction is mapped with ZoneKnit technology, placing eyelet mesh in high-heat zones to improve airflow and temperature regulation. Flatlock seams reduce friction, while a gusseted construction supports unrestricted movement.