Hi scubamom,
[quote]Meanwhile, we are pretty sure it is the mattress too… the first month was great… good support and contour under our side sleeping bodies - foam comfortably “soft”. Now when we lay sideways, it’s like the foam under our hips, shoulders, and upper legs are hitting the firmer sections below - feel like we have a brick under that whole part of our bodies.
I guess the best way to describe it is that the foam is losing buoyancy and compressing… enough to still be leaving an indention without springing back when we get out of bed. [/quote]
Some degree of softening is normal with all soft foam materials (the firmness of a foam material is also a factor in durability) and as the cover loses some of its initial stiffness … particularly over the course of the first few months when the materials are “breaking in” … but if there are no defects in the materials and they are high quality it will “stabilize” when the materials have broken in evenly in the parts that you sleep on less frequently or that have less weight on top of them. There is more about this in post #20 here.
Of course it’s also possible that the materials are defective and if the visible impressions (on a flat surface) are more than 3/4" then you would qualify for a warranty exchange as long as there are no stains on your mattress.
Phoenix