Sleep Sage editorial team · 500+ sleep products reviewed since launch
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Serta iSeries NXG 4500 Ultra Plush Foam
The softest bed Serta sells — ultra plush all-foam NXG
We publish a number only when supported by documented measurements. This review evaluates published specifications and policies.
Queen price on record
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
Verdict & testing evidence
Research Evaluation- Evidence type
- Research Evaluation
- In-person experience
- Not established for this exact model
- Published firmness
- 3.5/10 in our product record (not a lab result)
- Lab performance data
- No documented lab measurements
Product-gallery photos and manufacturer specifications are not independent test measurements. We do not assign numerical cooling, motion, pressure or durability scores without documented evidence.Editorial policy.
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 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 We do not publish cooling, motion-isolation, edge-support, pressure-relief, response, durability or off-gassing scores for the Serta iSeries NXG 4500 Ultra Plush Foam until the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) may provide more cushioning for side sleepers.
Back Sleepers
The Serta iSeries NXG 4500 Ultra Plush Foam may be too soft for back sleepers, particularly those over 180 lbs. Back sleepers who dislike substantial sinkage should also compare a firmer option; actual fit depends on body size and the model's construction.
Stomach Sleepers
At 3.5/10 firmness, the Serta iSeries NXG 4500 Ultra Plush Foam may be too soft for stomach sleepers. Stomach sleepers may want to compare a firmer model, especially if they notice uncomfortable hip sinkage.
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 were read from the brand's own site when this review was last updated and change with promotions, so confirm the price at checkout. 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
$2,999 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. These are research evaluations, so no numeric ratings are shown (why).
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
Common Themes in Owner Reviews
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. Common themes in owner reviews of the Serta iSeries NXG 4500 Ultra Plush Foam line up with the points below. We summarise recurring praise and complaints rather than republishing individual reviews, reviewer names, dates or helpful-vote counts, because those belong to the retailer and we cannot verify them here.
Praised most often
- 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
Most common complaints
- Too soft for most stomach sleepers
- Hips can drift out of alignment for heavier back sleepers
- $2,799 queen
Verified owner reviews written by Sleep Sage readers appear separately and are attributed to real accounts.
Quick Specs
- Type
- Memory Foam
- Firmness
- Soft
- Height
- Varies by comfort level
- Trial
- 120 nights
- Warranty
- 10 years
How We Researched the Serta iSeries NXG 4500 Ultra Plush Foam
This is a research evaluation. We have not put the Serta iSeries NXG 4500 Ultra Plush Foam through our physical lab protocol, so this page describes verified construction, manufacturer specifications, policies, comparative analysis and published owner feedback.
Research Evaluation: This mattress has not completed our physical lab testing protocol, and we publish no Sleep Sage lab measurements for it. Our evaluation is based on verified construction, manufacturer specifications, policies, comparative analysis and available owner feedback.
Construction & Materials Review
We document the mattress's published layer construction, materials, densities and cover fabrics from manufacturer specifications and supporting documentation.
Specification & Certification Verification
We check published specifications, certifications and material claims against the manufacturer's own documentation, and flag anything we cannot confirm.
Policy & Price Verification
Trial length, return terms, warranty coverage, shipping and current pricing are recorded from the retailer and re-checked when we update the review.
Owner Feedback Synthesis
We summarise recurring themes in published owner feedback rather than republishing individual reviews, names or vote counts.
Comparative Analysis
We position the mattress against comparable models we have measured, using construction similarities — never by assigning it measurements it does not have.
What We Have Not Done
No documented pressure mapping, thermal logging, motion-transfer, edge-deflection or durability measurements are available for this unit. We publish no lab scores until they are.
Editorial transparency: Ben Trapskin owns Yawnder, a mattress retailer, and Sleep Sage may earn commissions from qualifying purchases. Retail and affiliate relationships do not substitute for independent measurement evidence. We identify which observations are firsthand and which claims come from manufacturer sources. Read our full editorial policy and detailed testing methodology.
Owner Reviews
Real opinions from Serta iSeries NXG 4500 Ultra Plush Foam owners. 0 reviews
Related Articles & Guides
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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 prices on record for each Serta model we track. Some entries are research-only and have no completed hands-on or instrumented testing.
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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