The MD Mattress Model 400 Grayhawk Luxury Firm is a 14-inch tight-top innerspring with wrapped coils and a thin foam comfort stack. In our testing, it felt flat, steady, and easy to move across, with especially strong edge stability and reliable alignment for back and stomach sleepers. The downside was lighter cushioning at the shoulder, so it was less convincing for lighter side sleepers who need more sink.
Table of Contents
Product Overview
| Mattress | Overall Score | Pros | Cons | Ideal For |
|---|---|---|---|---|
| MD Mattress Model 400 Grayhawk Luxury Firm Mattress | 4.2/5.0 | Firm, level support; sturdy edges; easy movement | Less shoulder cushioning; only moderate cooling | Back sleepers; stomach sleepers; couples who use the edge |
Final Verdict
If you want a firm, no-fuss surface that stays level when you change positions, the Grayhawk is a solid match. It supported the hips well in our testing and kept the perimeter stable for sitting and edge sleeping. The trade-off is a tighter top that feels less forgiving at the shoulders, plus cooling that stayed more neutral than actively cool.
Who It’s For:
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Back sleepers who like a firm, flatter feel
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Stomach sleepers who need their hips held up
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Couples who use the full surface, including the edge
Who It’s Not For:
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Lightweight side sleepers wanting deeper pressure relief
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Anyone who wants a plush pillow top
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Very hot sleepers who want stronger cooling features
How We Tested It
We slept on the Grayhawk for three weeks and kept nightly notes on support, cooling, pressure relief, and ease of movement. We also ran sit-on-edge holds, a 16-pound kettlebell drop, repeated getting in and out of bed, and longer side-sleep sessions to see how it handled motion, edge stability, and shoulder pressure. Our scores use the same mattress testing process and the same category standards we apply to support, cooling, pressure relief, motion isolation, responsiveness, and edge support across the rest of our reviews.
Our Testing Experience
MD Mattress Model 400 Grayhawk Luxury Firm Mattress
Our Testing Experience
From the first night, the surface felt firm and level, with more of an “on top” feel than a sink-in one. In our testing, back sleeping felt especially steady because the midsection stayed lifted and the lower back never felt slack by morning. The coil unit also made turning easy. Side sleeping was more mixed: the center stayed supportive, but tighter positions created a sharper pressure spot at the front of the shoulder. Temperature control landed in the middle. The cover breathed reasonably well, yet we still noticed some warmth building once the foam layers had time to hold heat.
What we liked:
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Firm, even support that kept the hips lifted
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Strong perimeter for sitting and edge sleeping
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Quick push-back that made turning easy
Who it is best for:
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Back and combination sleepers who prefer firm beds
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Stomach sleepers who need flatter alignment
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Couples who want a usable edge
Where it falls short:
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Side sleepers who need deeper shoulder and hip cushioning
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Hot sleepers sensitive to foam heat buildup
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Shoppers looking for a plush, huggy top
Pros & Cons
| Pros | Cons |
|---|---|
| Firm, even support that keeps the hips lifted | Limited cushioning for lighter side sleepers |
| Stable perimeter for sitting and edge sleeping | Foams can warm up overnight |
| Responsive coils make position changes easy | Tight-top feel is less plush than a pillow top |
Key Specs
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Firmness: Firm, with a luxury-firm feel
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Profile: 14 inches
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Top style: Tight top
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Mattress type: Innerspring
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Cover: Tencel cover with a heather gray knit finish
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Comfort layers: Firm quilt foam, gel memory foam, comfort foam
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Support core: 360-degree foam-encased wrapped coils over base foam
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Coil count: 567 in a Queen
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Warranty: 10-year warranty
Review Score
| Metric | Score | Remarks |
|---|---|---|
| Support | 4.6 | Stayed flat and lifted through the midsection |
| Cooling | 3.8 | Breathable enough at first, then warmed to neutral |
| Pressure Relief | 3.9 | Better at the hips than the shoulder |
| Motion Isolation | 4.1 | Smaller movements were muted well |
| Responsiveness | 4.2 | Easy to turn without feeling stuck |
| Edge Support | 4.5 | Stable perimeter for sitting and edge sleep |
| Durability | 4.3 | The build still felt steady after weeks of use |
| Overall | 4.2 | Strong firm-support value with clear trade-offs |
Who Should Choose It?
If you’re still figuring out how to choose a mattress, start with sleep position and how much surface sink you want. The Grayhawk made the most sense in our testing for back sleepers, stomach sleepers, and combination sleepers who like a flatter, firmer innerspring feel and strong edge stability. If you usually need more give at the shoulder, a softer or medium mattress will likely be the better fit.
For side-sleep pressure relief, the Helix Midnight is an easier comparison point. If you want a firmer innerspring with a more polished finish and more comfort options, the Saatva Classic is another useful benchmark.
Limitations
The same tight-top build that gives the Grayhawk its support also limits how much cushioning you get before you reach the firmer foams and coil system. Side sleepers who curl up tightly were the most likely to notice shoulder pressure in our testing. Hot sleepers will probably see it as middle-of-the-pack for cooling: the breathable cover helps, but the foam layers can still hold enough heat to keep it from feeling truly cool. It also stays buoyant rather than delivering a slow memory-foam hug.
Alternatives
Look at these instead if your priorities are different:
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Brooklyn Bedding Signature Hybrid: a hybrid option with more bounce and multiple firmness choices
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Nectar Premier: deeper memory-foam contouring and gentler pressure relief
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Helix Midnight: a balanced medium feel that suits side sleepers better
Pro Tips
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Use a sturdy foundation or platform bed; if your setup uses a box spring, make sure the surface still stays flat and supportive.
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Give the bed a brief break-in period before you decide the shoulder pressure is a deal-breaker.
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Rotate it regularly instead of flipping it to keep wear more even over time.
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If side sleeping feels sharp at the shoulder, try a slightly taller pillow and a looser curl.
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Hot sleepers will do better with breathable sheets and a lighter protector.
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If partner movement bothers you, shared bedding can help soften some of the smaller ripples.
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Judge alignment by how your back feels in the morning, not by the first few minutes at bedtime.
FAQs
How firm does it feel night to night?
It read as a true firm to luxury-firm mattress in our testing. We stayed on top of the surface, the hips didn’t dip, and the top felt tight rather than pillowy.
How is motion isolation for two sleepers?
For a coil bed, it handled smaller movements well. Bigger shifts were still noticeable, but they were dulled enough that routine turning didn’t ripple across the whole surface.
Does it sleep cool?
Not really in the active-cooling sense. The cover helped it avoid feeling stuffy at first, but once the foam layers warmed up, it settled into a temperature-neutral feel.
