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Smartwool's Midweight series is the warmest of their base layers, and man are these pieces comfortable. The Midweight Zip-T makes a perfect base layer for any cold weather adventure, and also works great for stop and go activities (just wait and see how warm it keeps you on those cold lift rides). Just like everything Smartwool makes, it is super comfortable, amazingly functional and will help keep you warm, dry and un-funky.