Hmm, you sure? I have the STX package on my truck and the Katzkin XLT leathers fit the STX foam perfectly.

 

yeah on that other bit - ALL heated seats use an electromat style heater system. It is however true that you can turn on the seat cooler - and it will push air though the seat.

So if it's cold out - and you've have the heat on - you can turn on the seat cooler - and it will pull the warm air off the floor up and though the seat. So far I don't think anyone has disable that. But when you turn on the seat heater - it uses the electromat in the seat. which heats very quickly.