Hi scoaste,
You can read some comments about Dynasty mattresses in posts #3 and #4 here and the posts they link to and as you can see I would be very cautious here.
They don’t mention the density of the polyfoam layers but calculating what the weight of the Dynasty Cool Breeze king size “should be” if the specs in the description are correct (using 1.8 lb density for the polyfoam) leads to …
Top layer: 3" x 76" x 80" / 1728 x 5 lb = 52.8 lbs
Next layer: 2" x 76" x 80" / 1728 x 4 lb = 28.1 lbs
Bottom layers 8" x 76" x 80" / 1728 x 1.8 lbs = 50.7 lbs
Total weight based on foam densities "should be a total of 52.8 + 28.1 + 50.7 = 131.6 lbs.
Listed weight is only 110 lbs.
This means that either the foam density specs in the description are incorrect or the listed weight is incorrect.
As I mentioned in an earlier reply … I would be very wary about using other people’s suggestions about mattresses that would likely have very little knowledge about mattresses or mattress materials (or the mattress they purchased) and that may have very different needs and preferences from your own.
Phoenix