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
The Sealy Posturepedic Plus offers a great sleeping experience. It stands out for its edge support performance. The sides are difficult to compress, which increases the comfortable sleeping surface and can make it easier to get in and out of bed. However, it's not as outstanding in other areas. It's cooling enough for most people, but not quite enough for hot sleepers. It has good motion dissipation as well, so you'll feel movements near the source but not all over the mattress, and they dissipate quickly. This mattress has a layer of memory foam, which gives it somewhat slow responsiveness. This makes moving around in your sleep more difficult, but it isn't pronounced enough to create a very constricting feeling.
Medium-firm feel suitable for average back and stomach sleepers.
Good motion dissipation, so movement is less likely to wake you.
Cooling enough for most people.
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.
Slower responsiveness makes it harder to change sleeping positions.
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.
Cooling enough for most people.
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.
Good motion dissipation, so movement is less likely to wake you.
The Sealy Posturepedic Plus has fantastic edge support. The sides of the mattress barely compress when you sit or sleep near the edge. You have more room to comfortably share the mattress, and the edges offer a solid surface that makes it easier to get in and out of bed.
Outstanding edge support, so you can comfortably sit or sleep on the sides.
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.
Slower responsiveness makes it harder to change sleeping positions.
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.
Uses low-density, less durable foams.
Performance Usages
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.
- Updated Oct 06, 2025: Converted this review to Test Bench 1.0.1. We've added scoring to the Foam Layer Mass Density section and a new 'Longevity' performance usage. Read more about it in our Changelog.
- Updated Aug 15, 2025: Review published.
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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 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 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 uses a contouring memory foam layer but has high responsiveness, so it's 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 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.
The Sealy Posturepedic Plus Mount Auburn and the Novaform Legacy have different strengths. The Novaform is more cooling, so it's a better option for hot sleepers. It also offers a better motion dissipation performance, so movement is less likely to wake you up. Its more responsive feel also makes it easier to move around in your sleep. That said, the Sealy has significantly better edge support, which makes getting in and out of bed easier, especially for people with mobility issues.
We've recently started testing mattresses. We use objective data and repeatable testing for key characteristics like firmness, cooling, and motion isolation, to ensure each mattress gets the same treatment. Since we buy all of our mattresses, we can tear them down layer by layer and isolate the mechanical properties of every component: quilted tops, foams, coils, and any special materials. Our approach gives us unprecedented insight into how each product design decision contributes to a mattress's overall performance and feel, and allows us to tailor our results to different body types and sleeping positions.
Test Results
The Sealy Posturepedic Plus Mount Auburn is a 33 cm/13" mattress, so you may need to use deep-pocket fitted sheets.
It's a medium-firm mattress best suited for average back and stomach sleepers and heavier side sleepers. It likely won't offer enough pressure relief for lighter and average side sleepers, while heaver back and stomach sleepers may need a firmer mattress for proper spinal alignment.
The Sealy Posturepedic Plus is moderately bouncy. While it's not as bouncy as mattresses like the Beautyrest Silver BRS900, it avoids the lifeless feeling of some all-foam mattresses, which helps make it easy to change sleeping positions.
You sink moderately into the mattress's upper layers. The mattress doesn't contour your body very closely, so you feel slightly cradled but not enveloped or tightly hugged by the mattress.
It's somewhat slow to recover its shape after being compressed, which makes it feel a bit more difficult to change sleeping positions. However, it's not an extremely slow-moving mattress, so most sleepers won't feel uncomfortably held in place.
The Sealy Posturepedic Plus has good motion isolation. You'll feel most movements near the source, but only bigger movements across the whole mattress. Motion also dissipates quickly. Overall, you shouldn't be disturbed by every little move your partner makes, but you're more likely to notice bigger movements, like when they roll over. If motion isolation is a priority, some mattresses, like the Novaform Legacy, isolate motion better and dissipate it more quickly.
It has fantastic edge support. The sides of the mattress barely compress when you sit or sleep near the edge. This means you can comfortably sleep near the side, giving you more room to share, and it makes it easier to get in and out of bed, since the edges give you a solid surface to push off from.
It has a good cooling performance. It dissipates enough heat overnight to keep most people cool. However, it's not quite cooling enough for hot sleepers, especially for people who have trouble falling asleep because of feeling too hot, since its cooling performance isn't as strong during the first hour of sleep.
The manufacturer doesn't say what materials the sleeping surface is made of. The cover is not removeable or machine-washable.
The edges are reinforced with 16-gauge coils that are more tightly wound and feel stiffer compared with the 15-gauge coils used in the rest of the layer. This contributes to the mattress's outstanding edge support.
The quilted upper layer is made up of several different materials, including memory foam, polyfoam, and fiber fill. The 7.6 cm/3" layer is very soft overall, giving the mattress its moderate sinking. The memory foam helps add contouring.
The transition layer is made of much firmer polyfoam, which adds support and prevents you from sinking directly into the spring layer.
None of the foam used is dense enough to be considered good quality, which suggests the mattress will sag or form permanent body impressions sooner than mattresses that use higher-quality materials.
The 'Quilted Top Fill' result is for the upper layer of memory foam in the quilted layer. The other foams are similarly not dense enough to be considered good-quality. Here are the results for each:
Lower layer egg-crate polyfoam: 22.1 kg/m³ (1.3 lb/cu ft)
Lower lumbar area memory foam: 47.7 kg/m³ (2.9 lb/cu ft)
The quilted top fill is 7.6 cm/3.0" thick and has four distinct layers:
Fiber fill: 1.3 cm/0.5"
Memory foam: 1.3 cm/0.5"
Egg-crate polyfoam: 4.3 cm/1.7"
Memory foam (only in lumbar area): 0.8 cm/0.3"
These foams, along with the fiber fill upper layer, are very soft as a unit. Directly below is a very firm 4.8 cm/1.9" layer of polyfoam, so you may feel a firmer surface below if you fully compress the upper layers. This helps support your hips and lumbar area, but you may feel a noticeably firmer surface under the quilted layer, which might not offer enough pressure relief for side sleepers.
The Sealy Posturepedic Plus has a dense layer of 15-gauge support coils. They're pocket coils, which help with motion isolation and contouring versus continuous coils. The layer has a medium amount of stiffness overall, so it will provide support for the heavier parts of your body, although some bigger people may want a stiffer support layer.
The foams used in the lumbar area of the quilted layer are very soft when measured as a unit. The layer has a similar soft feel at the head and foot of the mattress, which lacks the additional 2 cm/0.8" of memory foam present in the lumbar area.
The memory foam in the quilted top is the firmer component of the layer, with medium firmness. The lower layer is convoluted or egg-crate foam that compresses very easily.
The strip of memory foam across the lumbar area isn't thick enough for us to measure its firmness. Here are additional firmness results for the other components of the quilted layer:
Quilted layer at head/foot
Memory foam upper layer
Lower polyfoam layer
In contrast to the soft quilted upper layer, the polyfoam transition layer is very firm.
The support layer has a medium amount of stiffness and will help support and contour the heaviest parts of your body like your hips or lumbar. However, many side sleepers need a softer support layer for pressure relief, and some back and stomach sleepers may prefer a stiffer spring layer for proper support.
The quilted layer has low resilience, so it's not very bouncy. This is mostly because of its memory foam upper layer, which has very low resilience. The egg-crate polyfoam in the quilted layer is much bouncier.
The polyfoam transition layer has much higher resilience. This firmer layer has more 'push back' and helps give the mattress its moderate bounciness, along with the springs.
Here are additional resilience results for the different components of the quilted layer:
Quilted layer at head/foot
Memory foam upper layer
Lower polyfoam layer
The springs are quite bouncy. This helps give the mattress its moderate bounciness, combined with the low-resilience quilted layer, and it makes changing sleeping positions easier compared with mattresses with less bounce.