The Icebreaker Sierra Glove's RealFleece feels as breathable as other fleeces, even though it's made of merino wool. Since it's merino wool, the Sierra thermally regulates your hand's temperature, naturally resists odor, and has an incredibly soft feel. Icebreaker's Nano technology helps the Sierra resist water when you're outdoors, and it's stylish for the city and functional for trails and running tracks.