Hi LBL,
Yes, they do use good quality and durable materials. The memory foam top 3" layer would take longer to expand that the rest of the mattress. 24-48 hours is normal for full expansions for most memory foams.
To update my information from yesterday, the two pieces of polyfoam are a total of 8" and they are a 2 lb density. The memory foam is the 5.3 lb at 3".
Yes, your entire mattress is hand made (they’re actually made to order). I would “put a wave” through the topper, as there is some flexibility in the cover used for this mattress and if it still isn’t the appropriate length, then you may very well be correct and you may have been accidentally sent a twin topper for use with a twin XL base, and I’m sure you’d be provided the correct topper if that was indeed the case.
This would make sense for the weight of the base mattress. Two pieces of 2 lb density polyfoam at 8" total in twin XL would be roughly 28 pounds ((38808 ) / 1728) 2 = 28.14 lb. Combined with the covering and the fibers, this would add about another 5 pounds. The topper would be roughly 28 pounds in a twin XL ((3880*3) / 1728) * 5.3 = 28. That’s without the covering.
Hopefully you’ll get the top memory foam panel figured out within the next day or so. And the item you purchased isn’t purported to be a Tempurpedic, but a comparable feel in this particular company’s lineup, as I explained in my previous reply. For some people, an approximate comfort to something they tested in-store from another brand is quite satisfying, especially taking the price savings into account (everyone has their own personal value equation), and in the case of the Astoria, some people even enjoy the ability to rearrange the bottom polyfoam layers to create different comforts. For others, not so much. But that’s something only you can determine through your own personal testing and preferences for a specific comfort, as ultimately your comfort is the most important part of this equation.
Phoenix