Planning to buy PU foam for a support core. I am light so ILD in the high 20’s is likely adequate for me. Doubt I need more than 10cm or so of height. Narrowed my options down to:
12.5cm mattress, ILD 29, density 1.75 lbf. $375 (NZD)
2 toppers stacked on top of each other. Each 5cm tall, ILD 27, density 2 lbf. $400 total
Price, ILD, and density are relatively similar. I’m wondering what the difference stacking 2 pieces of foam together vs having 1 continuous block would make. Does that make it firmer? Softer? Less durable? More durable? Which one would be the most optimal to choose? Let me know what you think.
Background: Last year I bought a 5cm latex topper, 65D, and have been sleeping on that over a gym mat until now. For most of that time it was a good comfort level, however in the last month or so it’s started feeling too firm for me - likely because of how hard the surface underneath it is. I believe it’s still sturdy enough to sleep on but I want to put something soft-ish underneath it.
Given your situation, let’s break down the differences between the two options and how they might impact your comfort, durability, and overall sleep quality:
1. Single Continuous Block (12.5cm, ILD 29, Density 1.75 lbf)
Pros:
Uniformity: A single block of foam will provide a consistent feel and support without any gaps or seams. This can lead to a more stable and even surface, which might be beneficial for reducing pressure points and providing better overall support.
Durability: Continuous blocks tend to be more durable as there are no seams that could potentially wear out or separate over time.
Ease of Use: It’s a straightforward option with no need for alignment or adjustment of separate pieces.
Cons:
Flexibility: Once you’ve bought it, you can’t easily change its configuration. If you want a different firmness or height later, you’d need to buy a new foam piece.
2. Two Toppers Stacked (Each 5cm, ILD 27, Density 2 lbf)
Pros:
Customizability: You can adjust the arrangement of the toppers or even use them separately if you ever need to. For example, if you find one topper is too soft, you could use the other one alone or in a different combination.
Initial Softness: The ILD of 27 might feel slightly softer initially compared to the ILD 29 in the single block, which could be a plus given your recent experience with a firm surface.
Cons:
Potential for Shifting: If the toppers are not secured properly, they might shift or move slightly, creating a less consistent sleeping surface. This could potentially lead to discomfort or uneven support.
Durability: The seam between the two toppers might wear out faster or become less durable over time, especially if the toppers are frequently adjusted or if they shift during use.
Considering Your Background and Needs
Given that your current setup with a latex topper over a gym mat has become too firm, you might benefit from the slightly softer ILD of the stacked toppers. However, the risk of the toppers shifting or having seams might affect the comfort and support you’re looking for.
Recommendation:
If you prioritize a consistent and even surface: The single continuous block of foam would likely be more suitable. It provides a uniform feel without potential issues from shifting or seams, and it might be more durable in the long run.
If you prefer initial softness and some flexibility: The two stacked toppers could offer a softer feel and flexibility. Just ensure that they are properly aligned and secured to minimize any movement or discomfort.
Given that the prices are quite close, I would lean towards the single continuous block for a more stable and potentially longer-lasting solution, especially since you’re dealing with a firm surface underneath and need something reliable and consistent.
Hmm, yeah. I’ve been leaning towards the 2 toppers solution because it’s somewhat more durable, and the potential for further configuration down the line is good. They’re actually 2 different brands of PU foams - Dunlop Elephant (used in the topper) and Dunlop Marathon (used in the mattress) - with the Elephant foam having a 10-year manufacturer warranty whereas the Marathon has only a 5-year one. Information on those brands is scant but I’m trying to find out more.
I think my main question now is which ILD is best for me as a support core - 27 or 29? I have tried out a 29 ild PU mattress and it was very firm for me, but I will be using the latex topper to relieve some pressure. 27 would likely work just as well, if not better. My concern is that as it wears out over time it’ll become too soft and unable to hold me up well. The 29 has a bit more “headroom” in that department. But as I’ve said, the 27 is a bit more durable than the 29. So I’m not sure which to pick.