I love this brand. I have the base layer and without sounding too dramatic, they saved my life. They pull moisture away from your body and keep you warm no matter the elements. I can't say enough good things about this brand.
Before I climbed North America's tallest mountain, I bought two pair of Icebreaker's merino leggings. I wore each pair for 7 days straight. They kept me warm. They kept me dry. They didn't smell after 7 days of hard sweating and climbing. Each night, I could crawl into my sleeping bag in the merino base layers I had worn all day, and I slept great.