That's not the point -- adding insulation to a cold object won't make
it any warmer. :-) Seriously, the purpose of the electric mattress
pad is to warm the bed itself before I climb in, so that it doesn't
suck away all my body heat and leave me shivering with my feet feeling
like blocks of ice.

So do you normally turn the electric mattress pad OFF
once you get into bed?

Also any advice on best electric mattress pad to buy?