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ArmorSpun is merino wool, strengthened. By applying science to nature’s best fiber, SITKA was able to create merino wool that meets a higher standard. They found that through intertwining durable nylon with merino wool they could significantly enhance abrasion-resistance while still allowing the merino to deliver its lightweight warmth and natural odor resistance. They used science to reinforce merino with nylon to give you the natural benefits of wool in a material that can survive thick brush and rocky ground.