Elevenate style with Merino wool. This lightweight t-shirt is perfect for hiking, mountain biking, running and just about anything else you want to do in it. A feature of Merino wool is that it absorbs odor caused by bacteria. It traps the smell and keeps it from building up, so wear it with confidence over and over again. Some even use it as a short sleeve, next-to-skin base-layer in the winter.