The evolution of icebreaker's original merino pullover top, the Original Long Sleeve Half Zip features 100% natural merino wool that’s ideal for hiking, skiing, travel or everyday wear. The reliable zip-neck design easily regulates body temperature and forward-set shoulder seams reduce chafing when worn with a backpack. Inspired by nature, icebreaker harnesses the performance qualities of natural fibers to offer an alternative to clothing based on petrochemical synthetics. Merino is an annually renewable fiber that naturally resists odors, keeps you cool when it’s hot and warm when it’s not, and lets your skin breathe for comfort all day, every day.