Heat obviously rises (same reason your attic has the most insulation in your house) so it is important that you have a thick well insulated cover.  Most of our hot tub covers are 6" thick, most manufacturers cheap out and only provide a 4" or 3" thick cover where you need the insulation the most.

Our Dominion line covers also have a full steam stopper hinge which is very important as you can see by the pictures below:

​​​​Hot Tubs Ottawa

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COVERS

You can see how the snow melts down the middle of the cover when you don't have a full steam stopper