The Sealy Posturepedic Plus Mount Auburn is a budget-friendly innerspring mattress sold at Costco (US). Its design includes pocket coils for support and zoned comfort layers, with an extra layer of memory foam in the lumbar area.
It has a medium-firm feel, so it's suitable for average back and stomach sleepers. Some bigger side sleepers may find it offers enough pressure relief, but most will want a plusher mattress. You sink moderately into its upper layers, but it has low contouring, so it doesn't hug our mold around your body. Its memory foam layer gives it a somewhat slow-moving feel, but it's moderately bouncy overall, which helps make it easier to move around in your sleep.
Our Verdict
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Light Weight
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Average Weight
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Heavy Weight
Medium-firm feel suitable for average back and stomach sleepers.
Outstanding edge support, so you can comfortably sit or sleep on the sides.
Too firm for most side sleepers.
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Light Weight
-
Average Weight
-
Heavy Weight
Medium-firm feel suitable for average back and stomach sleepers.
Outstanding edge support, so you can comfortably sit or sleep on the sides.
Too firm for most side sleepers.
-
Light Weight
-
Average Weight
-
Heavy Weight
Medium-firm feel suitable for average back and stomach sleepers.
Outstanding edge support, so you can comfortably sit or sleep on the sides.
Too firm for most side sleepers.
The Sealy Posturepedic Plus Mount Auburn is not a durable mattress. Its two foam layers, including a memory foam upper comfort layer and a polyfoam transition layer, are both made of low-density, lower-quality foam. This means it's prone to sagging or forming permanent indentations sooner than mattresses that use higher-quality materials.
Medium-firm feel suitable for average back and stomach sleepers.
Outstanding edge support, so you can comfortably sit or sleep on the sides.
Uses low-density, less durable foams.
Too firm for most side sleepers.
Medium-firm feel suitable for average back and stomach sleepers.
Outstanding edge support, so you can comfortably sit or sleep on the sides.
Too firm for most side sleepers.
Medium-firm feel suitable for average back and stomach sleepers.
Outstanding edge support, so you can comfortably sit or sleep on the sides.
Too firm for most side sleepers.
The Sealy Posturepedic Plus has a good cooling performance. It dissipates heat well overnight and won't make most people feel overheated. That said, it feels a bit warm when you first get into bed. It's not quite cooling enough for hot sleepers, especially if heat often prevents you from falling asleep in the first place.
Medium-firm feel suitable for average back and stomach sleepers.
Cooling enough for most people.
Outstanding edge support, so you can comfortably sit or sleep on the sides.
Too firm for most side sleepers.
The Sealy Posturepedic Plus has good motion dissipation. You'll mostly feel movement near its source, so you'll feel it in the lumbar area when your partner rolls over. However, it does a good job of isolating movement, so you'll feel it less at the head and foot of the mattress. Motion also dissipates quickly, making movement less likely to wake you up.
Medium-firm feel suitable for average back and stomach sleepers.
Good motion dissipation, so movement is less likely to wake you.
Outstanding edge support, so you can comfortably sit or sleep on the sides.
Too firm for most side sleepers.
The Sealy Posturepedic Plus is fairly responsive. The quilted top includes an upper layer of memory foam, which is slow to recover its shape after being compressed. This gives the mattress a slow-moving feel and makes it a little more difficult to move around in bed, but it's responsive enough that most people won't feel stuck in place.
Medium-firm feel suitable for average back and stomach sleepers.
Outstanding edge support, so you can comfortably sit or sleep on the sides.
Too firm for most side sleepers.
Slower responsiveness makes it harder to change sleeping positions.
Performance Usages
Changelog
- Updated Mar 09, 2026: We converted this review to Our Verdict section to clearly show the suitability of a mattress for your weight and sleeping position.
- Updated Feb 12, 2026: We converted this review to Test Bench 1.1. We've added new tests, including Body Conformity, Support, and Comfort Layers Envelopment, and also added scoring to the Bounciness test. Our usage scores have also changed, with new usages 'Side Sleeping,' 'Back Sleeping,' and 'Stomach Sleeping' replacing the 'Sleeping' verdict. We've also added 'Pressure Relief' and 'Support' performance usages. You can find more details in the full changelog.
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Updated Oct 23, 2025:
Compared its motion isolation performance to the Novaform Legacy's.
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Updated Oct 06, 2025:
We rewrote portions of this review to align with Test Bench 1.0.1, which adds a Longevity verdict and a score to the Foam Layer Mass Density box for users interested in the mattress's durability.
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Differences Between Sizes And Variants
The Sealy Posturepedic Plus Mount Auburn 13" Medium mattress is available at Costco (US) in a few sizes: Full, Queen, King, and California King. It comes in one firmness option, 'Medium.' Our results are only valid for the queen-sized variant. Here's a picture of our unit's label.
If you have experience with the Sealy Posturepedic Plus, we invite you to share your experience in the comments.
Popular Mattress Comparisons
The Sealy Posturepedic Plus Mount Auburn is a hybrid mattress with a medium-firm feel. Its edge support performance is outstanding, making it a good budget-friendly option if you want sturdy sides for getting in and out of bed or sleeping near the edge. However, it doesn't stand out for its cooling or motion dissipation, which are good but not great.
Its memory foam layer helps give it a somewhat sluggish feel, but it has low contouring, so you don't get the hugging feel often associated with memory foam. If you want a more contouring mattress, you might prefer either the Nectar Classic Hybrid or the Novaform ComfortGrande Plus, which are both medium-firm mattresses with more contouring and significantly better motion dissipation.
This mattress's medium-firm feel is suitable for back and stomach sleepers, but side sleepers may want a plusher mattress. You can find our recommendations on our list of the best mattresses for side sleepers. If you're interested in a mattress with memory foam, check out the best memory foam mattresses.
The Sealy Posturepedic Hybrid performs better than the Sealy Posturepedic Plus Mount Auburn in most respects. The Hybrid is a higher-end model with better cooling, making it better-suited for hot sleepers, and better motion dissipation, so you're less likely to wake up when your partner moves. It features a contouring memory foam layer, yet maintains high responsiveness, making it easy to move around in your sleep. That said, the Mount Auburn offers much better edge support, which is important if you want to maximize the comfortable sleeping surface or make it easier to get in and out of bed.
The Beautyrest Silver BRS900 and the Sealy Posturepedic Plus Mount Auburn have different strengths. They're both medium-firm, but the Beautyrest contours around you more, while you'll sink more deeply into the Sealy's upper layers. The Beautyrest is bouncier and more responsive, so it's much easier to move around on. The Sealy has a slower-moving feel, but a better motion dissipation performance, so you might prefer it for sleeping with a partner.
The Novaform ComfortGrande Plus and the Sealy Posturepedic Plus Mount Auburn have different strengths. They're both medium-firm and have somewhat low responsiveness, which creates a slow-moving feel. The Novaform is an all-foam mattress with very little bounce, making it more difficult to move around on, but it offers fantastic motion isolation, which may make it a preferred choice for light sleepers. The Sealy is bouncier, allowing you to change sleeping positions more easily, and it offers significantly better edge support, which is ideal if you want to maximize the comfortable sleeping surface or need solid sides to facilitate getting in and out of bed.
The Beautyrest Mattress is better than the Sealy Posturepedic Plus Mount Auburn for most people. These mattresses have a similar medium-firm feel, with moderate sinking and low contouring. However, the Beautyrest offers better cooling and significantly better motion dissipation. It's also much more responsive, which prevents you from feeling stuck in place. The Sealy includes denser foam layers that make it a bit more durable, but they aren't quite dense enough to be considered good quality.
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