The Buff? Merino Wool Thermal Beanie is a double-layer, brushed Merino wool hat delivering high-performance cozy. Naturally breathable, manages moisture, resists odors and is really soft and warm. Relaxed style delivers a contemporary look for skiing, boarding, bouldering or winter hiking. Buff? wool is sourced from humanely raised, non-mulesed sheep.Double-layer, 100% eco-friendly Merino wool. Soft and comfortable. Dries quickly, breathable, stays warm if wet. Naturally odor resistant. Sourced from non-mulesed sheep. One size fits most.