I believe that’s the Casper my girlfriend has and loves it!! I am also looking into getting it, because she raves about it so much!! She is a side and stomach sleeper (as am I, so did a lot of research and that was a top one).
One thing to note if you do get it make sure you have a box spring under the mattress and don’t directly lay it on slats. If your looking for firm, It needs a sturdy box spring or will make it feel
soft and sink into it.