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With your thermal underwear taken care of, the second skin is your first ‘official’ layer. Here at ioMerino, our second skin layers are made with an exclusive, superfine Australian Merino fabric that’s lightly ribbed to create tiny air pockets at both the skin and interlayers to effectively trap warmth and add an extra layer of insulation to help keep you warmer than you would ever believe possible from such a lightweight top. Shop men's and women's lightweight thermal long sleeve tops and tanks at ioMerino.