King and Queen Amethyst Biomats are meant for queen and king sized beds. They are meant for people who want to sleep on a Biomat. The King and Queen are hefty and are meant to be placed on a bed and left there. If you are looking for a full body sized Biomat that's portable, check out the Professional.
But for those of you who know you want to sleep on the Biomat every night, the King or Queen is perfect, just choose the size of your bed. Each side of the Queen or King Amethyst Biomat can be controlled separately. If the person you are sleeping with wants a low temperature and you want it a little higher, that's only possible with a Queen or a King sized Biomat.