KEEP YOURSELF WARM IN THE OUTDOOR RESEARCH ALPINE ONSET BALACLAVA.As a much needed base layer, The Outdoor Research Alpine Onset Balaclava gets the job done right. It is made of soft merino wool, nylon, and spandex that sits against your skin making you comfortable and warm. Whether you wear it while climbing to new heights or skiing down a mountain, you'll love it's anti-odor and moisture wicking technology that is made for the ultimate satisfaction. FEATURESBreathableWickingAnti-odorFlat-seam constructionHelmet compatible83% Merino Wool, 12% Nylon, 5% Spandex