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Base layers, thermals, long johns, long underwear, no matter what you call them, Merino Wool base layers are Mother Nature’s ultimate in warmth. Here at ioMerino, our high performing Merino Wool Thermal Base Layers are as good as it gets. Whether you’re going with a single layer in milder conditions or layering up a few, you’ll want them to be as lightweight and comfortable as they are warm.
