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There’s not an expert on Earth who won’t agree Merino is Mother Nature’s ultimate base layer. Here at ioMerino, our high performing thermal base layers are as good as it gets. Whether you’re going with a single layer in milder conditions, or layering up, you’ll want this to be as lightweight and comfortable as it is warm. Shop men's and women's Merino wool base layer tanks, tees, long sleeve tops, tights and more.