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Anything that goes over a base, but potentially under an outer layer, usually gets called a ‘mid layer’. Because it’s in the middle. Makes sense, right? Here at ioMerino, we offer a range of warm and comfortable high performing mid layers for all of your outdoor adventures. Made with superfine Australian Merino Wool, these thermal mid layers are just as soft as they are warm. Shop men's and women's high performance mid layer hoodies, jackets, pull overs, leggings, vests and more.