What Our Gearhead® Experts Are Saying:"I’ve worn the Merino 200 Oasis 1/2-Zip on backcountry ski tours and fall trail runs, and it always nails the balance between warmth and breathability. The quarter-zip is perfect for dumping heat, and it never smells, even after multi-day use. It layers like a dream under a shell or midlayer, and the pure merino build means it regulates temperature better than any synthetic I've tried."We count on the Icebreaker Merino 200 Oasis Long-Sleeve 1/2-Zip Top when we're moving fast through chilly air or bundling up for alpine starts. Its 100% merino wool construction naturally regulates body temperature, wicks moisture, and resists odors, making it ideal for everything from early-morning hikes to multi-day ski tours. This midweight baselayer is thoughtfully built with a slim fit for streamlined layering and a zip-neck collar for on-demand ventilation. Whether we’re running cold ridgelines, throwing skins on at the trailhead, or sipping coffee at camp, the Merino 200 Oasis keeps us comfortable without the need to constantly change layers.