I swear this was a banner ad and that I saw it here. It was a long, square stone you could put on the woodstove, it had a leather lanyard, and you put it on top of your stove. It was probably soapstone. You could then toss it in your bed, bath, boots, gloves, pants - maybe not pants - and it would warm it up. I cannot find these for the life of me. HALP?