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Serta iSeries NXG 4500 Ultra Plush Foam
The softest bed Serta sells — ultra plush all-foam NXG
Research evaluation — full lab score pending
Today's price — Queen
Warranty
10 years
Trial Period
120 nights
Shipping
Free shipping
Height
Varies by comfort level
Our verdict
Serta iSeries NXG 4500 Ultra Plush Foam is part of Serta's current memory foam lineup. Serta lists the queen at $2,799 (list $3,199). Our score reflects a published specifications and research evaluation of the current model — construction, materials, published firmness, price-per-size and how it stacks up against the rest of the Serta range — rather than a completed lab protocol on this exact unit.
Serta iSeries NXG 4500 Ultra Plush Foam Photos
What Our Research Found
This assessment is based on published manufacturer specifications, materials analysis and verified owner feedback. We have not physically tested this model, so nothing below describes first-hand use.
Performance assessment
How we score (1–10 rubric) →Evaluated through published specifications, manufacturer information, verified owner feedback and materials analysis. Not physically tested in our lab. We do not publish cooling, motion-isolation, edge-support, pressure-relief, response, durability or off-gassing scores for the Serta iSeries NXG 4500 Ultra Plush Foam until the full protocol is complete. Everything below — construction, materials, firmness, pricing, trial and warranty — is verified specification and editorial analysis.
Research evaluation — full lab score pending
The Serta iSeries NXG 4500 Ultra Plush Foam has been evaluated from published specifications, manufacturer data, materials analysis and verified owner feedback. It has not been through our lab. Rather than publish estimated numbers, we leave this table empty and publish no Sleep Sage performance scores until the measurements exist.
Firmness Level
Soft (3.5/10)
What We Love
- Genuinely plush — deep shoulder and hip relief
- Best-in-line motion isolation
- Ultimate Edge keeps a plush foam bed from collapsing at the rail
- CoolFeel Plus cooling
What Could Be Better
- Too soft for most stomach sleepers
- Hips can drift out of alignment for heavier back sleepers
- $2,799 queen
Best For
- Strict side sleepers
- Lighter sleepers under 180 lb
- Shoulder and hip pressure sufferers
Not Ideal For
- Stomach sleepers
- Sleepers over 250 lb
- Anyone wanting a firm surface
Mattress Construction
CoolFeel Plus cover
Cooling cover system
NXG memory foam
Thick ultra-plush contouring stack
Transition foam
Cushioned step-down layer
High-density core with Ultimate Edge
Reinforced perimeter and durable base
Sleep Position Analysis
Side Sleepers
The Serta iSeries NXG 4500 Ultra Plush Foam's softer feel (3.5/10) provides excellent pressure relief for side sleepers. The comfort layers cradle shoulders and hips, preventing pressure points that cause tossing and turning. We recommend this mattress for side sleepers of all body types.
Back Sleepers
The Serta iSeries NXG 4500 Ultra Plush Foam may be too soft for back sleepers, particularly those over 180 lbs. Excessive hip sinkage can cause spinal misalignment and morning back pain. Lighter back sleepers (under 150 lbs) may still find adequate support.
Stomach Sleepers
At 3.5/10 firmness, the Serta iSeries NXG 4500 Ultra Plush Foam may be too soft for stomach sleepers. The comfort layers allow hip sinkage that can hyperextend the lower back, leading to morning pain. Stomach sleepers should consider a firmer option (7+ on our scale).
Combination Sleepers
The Serta iSeries NXG 4500 Ultra Plush Foam's memory foam construction contours to each sleep position but may resist quick position changes. Slower-responding foam can make combination sleepers feel briefly "stuck" when transitioning.
Which Serta iSeries NXG 4500 Ultra Plush Foam Model Should You Buy?
Serta's current mainline lineup, with direct-from-Serta queen pricing verified on serta.com. Retail partners stock brand-exclusive variants of several of these models under different names, so match construction rather than name when you shop in store.
| Model | Firmness | Best for | Queen |
|---|---|---|---|
| Serta Classic Mattress (Standard) | 6.5/10 | Guest roomsSerta's entry innerspring — wrapped coils and three back-support zones | $499 |
| Serta Classic Mattress (Enhanced) | 6/10 | Budget shoppers who want some contouringThe Classic with a gel memory foam comfort layer added | $599 |
| Serta Five Star Mattress | 6/10 | Online shoppersSerta's boxed mattress — ships compressed and expands fast | $519 |
| Serta iComfort Mattress (Standard) | 6/10 | Couples sensitive to motionFive support zones and cool-to-the-touch fabric in Serta's memory foam line | $1,199 |
| Serta iComfortPro Level Two | 6/10 | Side and combination sleepersLatex-topped zoned foam — Serta's answer to premium pressure relief | $2,499 |
| Serta iComfortPro Level Three | 5.5/10 | Luxury foam buyersUp to 13 inches of latex — the top of the iComfortPro range | $3,599 |
| Serta iSeries NXG 1500 Hybrid Firm | 7.5/10 | Back sleepersThe entry point into Serta's NXG hybrid range | $1,899 |
| Serta iSeries NXG 2500 Hybrid | 6/10 | Couples with different sleep positionsAdds Deep Reaction gel foam to the NXG hybrid recipe | $2,199 |
| Serta iSeries NXG 3500 Hybrid | 6.5/10 | CouplesMicro coils and CoolFeel Plus at the top of the NXG hybrid line | $2,599 |
| Serta iSeries NXG 3500 Medium Foam | 5.5/10 | Couples who hate motion transferAll-foam NXG with Ultimate Edge support, medium feel | $2,599 |
| Serta iSeries NXG 4500 Ultra Plush Foam | 3.5/10 | Strict side sleepersOur pick on this page. | $2,799 |
| Serta Perfect Sleeper Hybrid | 6/10 | Back sleepersSerta's mainstream hybrid, built around back and body support | $1,199 |
| Serta Perfect Sleeper Cascade Ridge Plush 12.5" | 4.5/10 | Traditional innerspring fansTraditional plush innerspring at an entry price | $799 |
| Serta Perfect Sleeper Cascade Canyon | 5.5/10 | Hot sleepers who want an innerspringQ4 4-in-1 coils, five comfort zones and a wool cooling layer | $899 |
| Serta Perfect Sleeper X Quilted Hybrid Level One | 6/10 | Back sleepersQuilted-top hybrid with Q4 support and Perfect Conform memory foam | $1,699 |
| Serta Perfect Sleeper X Quilted Hybrid Level Two | 5.5/10 | CouplesAdds micro coils and extra memory foam to the quilted-top hybrid | $1,799 |
Serta iSeries NXG 4500 Ultra Plush Foam Prices by Size
Per-size pricing for the Serta iSeries NXG 4500 Ultra Plush Foam, taken from serta.com. List prices are shown first with Serta's current direct price alongside; Serta discounts this lineup heavily around Presidents' Day, Memorial Day, Labor Day and Black Friday.
| Size | Dimensions | List price | Typical sale price |
|---|---|---|---|
| Twin XL | 38" x 80" | $2,899 | Serta.com: $2,499 |
| Full | 54" x 75" | $3,049 | Serta.com: $2,649 |
| Queen | 60" x 80" | $3,199 | Serta.com: $2,799 |
| Split Head Queen | 60" x 80" (split head) | $3,799 | Serta.com: $3,399 |
| King | 76" x 80" | $3,899 | Serta.com: $3,499 |
| Split Head King | 76" x 80" (split head) | $4,499 | Serta.com: $4,099 |
| Cal King | 72" x 84" | $3,899 | Serta.com: $3,499 |
Prices tracked from the brand's direct site and updated as promotions change. See our current mattress deals hub for live discounts.
Serta iSeries NXG 4500 Ultra Plush Foam vs. the Alternatives
Serta iSeries NXG 4500 Ultra Plush Foam vs. Nectar Classic
$699 queenChoose the Serta iSeries NXG 4500 Ultra Plush Foam if: You want Serta iSeries NXG 4500 Ultra Plush Foam's plush feel with Serta's in-store availability, 120-night trial and 10-year warranty.
Choose the Nectar Classic if: You want Nectar Classic's build and are willing to shop outside the Serta lineup to get it.
Read the full Serta iSeries NXG 4500 Ultra Plush Foam vs. Nectar Classic comparison →Serta iSeries NXG 4500 Ultra Plush Foam vs. Tempur-Pedic ProAdapt
$3,199 queenChoose the Serta iSeries NXG 4500 Ultra Plush Foam if: You want Serta iSeries NXG 4500 Ultra Plush Foam's plush feel with Serta's in-store availability, 120-night trial and 10-year warranty.
Choose the Tempur-Pedic ProAdapt if: You want Tempur-Pedic ProAdapt's build and are willing to shop outside the Serta lineup to get it.
Read the full Serta iSeries NXG 4500 Ultra Plush Foam vs. Tempur-Pedic ProAdapt comparison →Serta iSeries NXG 4500 Ultra Plush Foam vs. DreamCloud Premier
$1,099 queenChoose the Serta iSeries NXG 4500 Ultra Plush Foam if: You want Serta iSeries NXG 4500 Ultra Plush Foam's plush feel with Serta's in-store availability, 120-night trial and 10-year warranty.
Choose the DreamCloud Premier if: You want DreamCloud Premier's build and are willing to shop outside the Serta lineup to get it.
Read the full Serta iSeries NXG 4500 Ultra Plush Foam vs. DreamCloud Premier comparison →Where the Serta iSeries NXG 4500 Ultra Plush Foam sits in Serta's lineup
The softest bed Serta sells — ultra plush all-foam NXG. Serta iSeries NXG 4500 Ultra Plush Foam is built around reinforced perimeter and durable base.
Serta sells this model at $2,799 for a queen (list $3,199). That places it at the premium end in the current lineup, which runs from the $499 Classic innerspring up to the $3,599 iComfortPro Level Three. If your budget is fixed, the table above is the fastest way to see what a hundred dollars either direction actually buys you inside the same brand.
Construction and what the feel is like
The comfort stack is: CoolFeel Plus cover — cooling cover system; NXG memory foam — thick ultra-plush contouring stack; Transition foam — cushioned step-down layer; High-density core with Ultimate Edge — reinforced perimeter and durable base.
In practice, that build gives a plush surface. Strict side sleepers sleepers get the most out of it; stomach sleepers will want to look one model up or down the range. Serta's zoned support systems all share the same idea — firmer coils or foam under the hips and lumbar, softer at the shoulders — so moving between models in this lineup changes the comfort layers far more than the support feel.
Trial, warranty and how we scored it
Serta.com sells this model with a 120-night trial and a 10-year limited warranty, with free shipping. Buying through a retail partner such as Mattress Firm or Costco changes both the trial terms and the price, so confirm the return window at checkout rather than assuming Serta's direct policy applies.
Our 8.5 score is an editorial score. It is not the output of a completed lab protocol on this individual unit, and we say so on every Serta page rather than implying testing we have not done.
Serta iSeries NXG 4500 Ultra Plush Foam Buyer Questions
What People Cross-Shop Against the Serta iSeries NXG 4500 Ultra Plush Foam
The five beds closest to the Serta iSeries NXG 4500 Ultra Plush Foam on price, firmness and build in our catalog — and the one thing each does differently. Editorial ratings are out of 10 on our published rubric.
Loom & Leaf Memory Foam is a nearby alternative by price, firmness and construction. Compare the verified specifications, policies and evaluation method before choosing.
Tempur-Pedic TEMPUR-ProAdapt is a nearby alternative by price, firmness and construction. Compare the verified specifications, policies and evaluation method before choosing.
Saatva Contour5 is a nearby alternative by price, firmness and construction. Compare the verified specifications, policies and evaluation method before choosing.
Casper Snow Max Hybrid is a nearby alternative by price, firmness and construction. Compare the verified specifications, policies and evaluation method before choosing.
Birch Elite Natural is a nearby alternative by price, firmness and construction. Compare the verified specifications, policies and evaluation method before choosing.
Want a different pairing? Build your own in the side-by-side comparison tool or browse the full sortable rankings.
Serta iSeries NXG 4500 Ultra Plush Foam Current Price
Queen pricing. List price $3,199, currently advertised at $2,799 (13% off).
Frequently Asked Questions
What owners report elsewhere
Owner feedback summarized from published customer reviews on Serta's website and major retailer listings. SleepSage cannot verify individual purchases, so no purchase-verified badge is shown. Sleep Sage reader reviews are a separate dataset and appear further down this page.
Quick Specs
- Type
- Memory Foam
- Firmness
- Soft
- Height
- Varies by comfort level
- Trial
- 120 nights
- Warranty
- 10 years
How Sleep Sage Evaluates Mattresses
When a mattress enters our lab, our full testing protocol may include pressure mapping, temperature measurements, edge-support testing, motion-isolation testing and other performance measurements. The steps below describe that protocol — they are not a claim that every reviewed product has been through it.
For products labelled Research Evaluation, we have not completed that physical lab protocol. Those reviews are based on verified construction, manufacturer specifications, policies, comparative analysis and available owner feedback.
Research Evaluation: This mattress has not completed our physical lab testing protocol. Our evaluation is based on verified construction, manufacturer specifications, policies, comparative analysis and available owner feedback.
Panel Testing
For mattresses we physically test, our panel may include sleepers with different body weights, sleep positions and comfort preferences over multiple nights.
Pressure Mapping
For mattresses that enter our lab, our protocol may include pressure mapping to evaluate pressure distribution in side, back and stomach sleeping positions.
Temperature Testing
For lab-tested mattresses, we may track surface temperature with thermal sensors under controlled conditions (68°F room, 45% RH, standard bedding).
Edge & Motion Isolation
For mattresses we physically test, edge support may be evaluated with standardized compression loads, while motion transfer may be measured from a standardized drop at multiple distances.
Durability Simulation
When durability testing is completed, our protocol may apply repeated pressure cycles and compare firmness and support measurements before and after the simulation.
Value Assessment
For every evaluation, our value review may consider verified materials, certifications, warranty terms and current pricing against comparable products in the category.
Editorial independence: Our testing lab operates independently from our affiliate partnerships. Brands cannot pay for higher scores or influence our methodology. Read our full editorial policy and detailed testing methodology.
Owner Reviews
Real opinions from Serta iSeries NXG 4500 Ultra Plush Foam owners. 0 reviews
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How Serta iSeries NXG 4500 Ultra Plush Foam compares
Side-by-side breakdowns we've published featuring Serta.
- Beautysleep Dream Weaver Hybrid vs Serta Five Star
- Serta Iseries Nxg 3500 Hybrid vs Serta Iseries Nxg 2500 Hybrid
- Serta Iseries Nxg 2500 Hybrid vs Serta Iseries Nxg 1500 Hybrid
- Serta Iseries Nxg 3500 Hybrid vs Serta Iseries Nxg 3500 Foam
- Serta Iseries Nxg 4500 Foam vs Serta Iseries Nxg 3500 Foam
- Serta Perfect Sleeper Hybrid vs Serta Iseries Nxg 1500 Hybrid
Related Mattresses
Relevant Guides
Every Serta model in our directory
Specs, construction, size options, and current pricing for each Serta model we track — including the ones that haven't come through the Encinitas lab yet.
More on Serta and its closest rivals
Brand-level context for this review: Serta's construction philosophy, pricing bands, trial and warranty terms, plus the competitors we cross-shopped it against.
- Serta review & brand guideAmerica's highest-volume mattress brand, sold in nearly every furniture store.Queen $499–$2,499 · Varies by retailer (commonly 100–120 nights)
- Sealy review & brand guideThe mainstream Posturepedic name, now part of Tempur Sealy International.Queen $499–$2,299 · Varies by retailer (commonly 100 nights)
- Beautyrest review & brand guideSimmons' pocketed-coil flagship, from mainstream Beautyrest to Beautyrest Black.Queen $699–$3,499 · Varies by retailer (commonly 100–120 nights)
- Tempur-Pedic review & brand guideThe original viscoelastic foam mattress brand, born from NASA tech.Queen $2,099–$6,499 · 90-night home trial
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