What Our Gearhead(R) Experts Are Saying:"This quarter-zip is the first thing I reach for when layering. The Merino-polyester blend regulates heat during high-output activities, and the flat seams make it comfortable enough to wear for days on the trail."We rely on the Outdoor Research Alpine Onset Merino 150 1/4-Zip Top for all-day comfort during high-output pursuits and extended adventures. Crafted with a premium blend of Merino wool and recycled polyester, this base layer wicks moisture, regulates body temperature, and resists odor, making it ideal for multi-day trips. The lightweight fabric ensures we stay comfortable without overheating, while the 1/4-zip design allows quick ventilation when the pace picks up. Thoughtful details like flat-seam construction and a next-to-skin fit make this an essential piece for any layering system.