Hmm I wonder if thats the same type of mat that Duggan picked up recently. I've been running just the HPS in the tent thus far and it has definitely been warm enough in there without a heater. The garage is getting cold enough now that the tent is dipping sub 20C briefly until it warms up outside a little. I have a feeling my temps will be too low without the HPS.
Worst case, I put the heater back in.
No, his is more of a boot warmer, doesn't go under a rug and is considerably smaller and less expensive. Mine is made for under rugs, that is what I bought it for then had an ah ha moment when my temps were too low. It's 5x7 and keeps the pots nice and comfy, ha! I think it's how I got through this past round of flower girls living in the very cold garage, it may have been cold in the tent but the pots/roots were nice and warm.