This beanie looks fashionable while being made of a truly high-end performance fabric. The Merino wool and Tencel (TM) work together to create breathable odor resistant coverage and comfort for all day wear. This beanie is great as a standalone accessory, but also works well under helmets and hats when a bit of extra coverage is needed. The fabric on this product is the powerhouse. Breathable and lightweight, the merino wool and Tencel (TM) work together to provide odor resistant coverage while managing moisture, meaning this is a great option for an activity where you might work up a bit of a sweat. The Tencel (TM) Active Cellulosic fibers are derived from renewable wood sources and the fabric is 100% biodegradable, meaning it's a sustainable option for all of your outdoor adventures. Turtle Fur Merino Wool with Tencel Beanie | Charcoal | Christy Sports