Why is the mantle so hot?

I'm puzzled, why is the mantle so hot?" My voice echoed in the quiet chamber, my curiosity piqued by the unexpected warmth emanating from the mantle. I reached out to touch the fabric, expecting a comfortable, cozy feel, but instead, my fingertips were greeted by a surprising heat. It was odd, for the room was comfortably cool, yet the mantle seemed to radiate warmth of its own. I examined the garment closely, searching for any clues that might explain its unusual temperature. The material appeared ordinary, with no visible signs of heating elements or unusual stitching. Yet, the heat persisted, a mystery that begged for explanation. "Perhaps it's some sort of special material?" I mused aloud, my mind racing with possible explanations. "Or maybe there's some hidden mechanism at work?" I couldn't shake the feeling that there was more to this mantle than met the eye. The question remained unanswered, but my curiosity was piqued. I decided to delve deeper into the mantle's secrets, determined to uncover the reason behind its unexpected warmth.