UQs and UQPs are both made with the same types of fabric. It is much easier to wash an UQP than it is to wash a UQ. So...protecting your investment in a UQ is why the UQP came to be. The UQP doesn't add warmth...it helps to keep the warmth your body generates in the UQ...thus creating a warmer sleeping environment. This is why it is important to have the UQP breathable to avoid condensation issues.
Donna
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