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For me, base layer is anything that wicks moisture away from the body. Thermal layers can also do this. So it'd be easy to confuse the two.
Thermal layer is anything that has insulation. I've never use the term thermal layers very much so I'm not familiar with them. Here's my take on it. I think long johns, which can be made of cotton can be thermal layer but doesn't take away moisture. Cotton actually absorbs moisture really well, so it's a terrible if you're going to sweat out or be in the rain.
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