electric carpet; heated carpet
A thin, portable electric mat or rug used for floor heating, common in Japanese homes during colder months. Despite the English-derived name, it is a wasei-eigo term; native English speakers would call it an 'electric rug' or 'heated mat'.
wasei-eigo (Japanese-coined English), from hot carpet
In winter, I like lounging around on the electric carpet.
I bought a new heated carpet, so the room got warmer.