Why does the coral fleece blanket get hotter and hotter?

Coral velvet has fine silk fineness and small bending modulus; it has a fine texture and a soft feel, and has the characteristics of "large surface area". All objects with large surface area have strong adsorption capacity. When covered with a coral fleece blanket, it will absorb the heat from the human body, and then play a role in heat preservation.
The more you cover, the hotter it is because people feel the heat of coral fleece, and people themselves also carry heat, so they will get hotter and hotter.