The eco-friendly Lightweight Merino Wool Multifunctional Headwear delivers true four-season comfort and protection. It’s a soft, warm, wind-resistant, and lightweight layer made with 100 percent Merino wool. Wearable in 10 different ways, it’s versatile multisport headwear delivering four-season performance with natural moisture wicking and odor control properties. BUFF  Merino wool is sourced from humanely raised, non-mulesed sheep.