When camping in Mammoth, they worked well (not great) as a base layer for my kid's pajamas. The first night they wore only these thermal underwear and were freezing. The next night we layered them using this as a base. It helped keep them a little warmer. Considering the price of these thermal materials, I'm disappointed with how thin the material is and that they don't keep my kids warm without covering them up. I was expecting a thicker thermal material and it wasn't. Almost transparent on light colors. I will continue to wear them under my pajamas when camping and under our winter gear in the winter, but I wouldn't buy them again.
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