Smartwool's new eco-conscious plant-based dyes bring this men’s base layer hoodie closer to nature and create a one-of-a-kind look for each shirt. Couple that with the 100% responsibly sourced Merino wool fabric for breathability and temperature control and the flatlock seams to reduce chafing, and your unique look is also functional and comfortable. Add to it the hood to help keep your noggin warm, and this base layer is ready to go for any outdoor adventure.