Serta iSeries NXG 3500 13.5 inch medium hybrid mattress in a modern bedroom with cooling geometric cover. Serta iSeries NXG 3500 medium mattress on an adjustable base, showing versatile split design support. Interior cross-section of Serta iSeries NXG 3500 hybrid mattress highlighting coil support and pressure relief. Serta iSeries NXG 3500 medium firmness scale, offering a balanced blend of cradling comfort and support. Close-up of the cooling geometric fabric on the Serta iSeries NXG 3500 13.5" medium hybrid mattress. Serta iSeries NXG 3500 medium firmness scale, offering a balanced blend of cradling comfort and support Full view of the Serta iSeries NXG 3500 hybrid mattress with a moisture-wicking cooling cover. Full view of the Serta iSeries NXG 3500 hybrid mattress with a moisture-wicking cooling cover. Side profile of the Serta iSeries NXG 3500 mattress showing high-quality cooling materials and durable edges. Side profile of the Serta iSeries NXG 3500 mattress showing high-quality cooling materials and durable edges. Overhead view of the Serta iSeries NXG 3500 split medium hybrid mattress with breathable blue fabric. 13.5 inch side profile of the Serta iSeries NXG 3500 hybrid mattress highlighting durable construction. 13.5 inch side profile of the Serta iSeries NXG 3500 hybrid mattress highlighting durable construction. Perspective view of the Serta iSeries NXG 3500 hybrid mattress on a split adjustable bed base. Exploded diagram of Serta iSeries NXG 3500 layers showing lumbar support and targeted pressure relief.
Serta iSeries NXG 3500 Hybrid Medium 13.5 Inch Mattress
Ultra Soft Soft Medium Soft Medium Medium Firm Firm Extra Firm

Serta iSeries NXG 3500 Hybrid Medium 13.5 Inch Mattress

$2,599.00
$3,499.00
Save $900.00
Brand: Serta
Size
Best for Side, back and combination sleepers
i Size Guide
$2,599.00
Only 17 left in stock
Free Shipping · Ships Within 1–3 Weeks Free Shipping · Ships Within 1–3 Weeks
10-Year Limited Warranty 10-Year Limited Warranty
100-Night Trial 100-Night Trial

To begin with, the 13.5 inch medium hybrid mattress greets you with a CoolFeel™ knit cover that stays cool and breathable the instant you lie down. Next, layers of NXG Next Generation Memory Foam combine with gel-infused cooling foam layers to deliver advanced temperature regulation while offering a gentle contour that side and back sleepers love. 

Because these foams sit over a Duet Coil-in-Coil Support System, you receive targeted spinal alignment and uplifting support that many reviewers call the best 13.5 inch hybrid mattress USA for combination sleepers.

Individually wrapped inner-and-outer springs flex independently, providing reduced motion transfer for couples so partners rest undisturbed. A high-density foam encased edge reinforces every side, expanding usable surface and easing morning exits.

 Finally, you can Buy Serta iSeries NXG 3500 online today, enjoy free nationwide delivery, flexible Affirm financing, and a 120-night risk-free trial while the holiday sale lasts.

Balanced Medium Comfort

NXG foam cushions joints while coils prevent sag for all-night support.

5-Zone Duet Coil Core

Inner micro-coil nested within an outer coil tailors push-back to each body zone.

Dual-Cooling Foam Blend

Gel and open-cell structure wick heat for a cooler, deeper sleep.

Motion-Quiet Hybrid Design

Pocketed springs absorb partner movements for uninterrupted rest.

Ultimate Edge® Strength

Dense rails stop roll-off and let you sit or sleep right to the border.

Sale + Easy Payments

Current markdown plus Affirm split pay simplify ownership.

Key Mattress Benefits

Serta iSeries NXG 3500 Hybrid Medium 13.5 Inch Mattress

6 Layers
Of Cooling
Comfort

Breathable fibres pull heat and moisture away for a fresh-touch surface.

Contours precisely while transferring warmth away from the body.

Balances plush contour and firm lift before the coil unit.

Inner micro-coil nested inside a taller outer coil delivers adaptive lift and zoned pressure relief.

Robust rails strengthen edges for lasting durability and 100 % usable surface.

Firm bottom foam anchors the hybrid core and dampens vibration.

Serta iSeries NXG 3500 Hybrid Medium 13.5 Inch Mattress
Serta iSeries NXG 3500 Hybrid Medium 13.5 Inch Mattress Serta iSeries NXG 3500 Hybrid Medium 13.5 Inch Mattress Serta iSeries NXG 3500 Hybrid Medium 13.5 Inch Mattress
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Whether its day or night, our dedicated team is always available to answer questions, resolve issues, and guide you through every step.

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Not sure which mattress suits you best? our sleep experts are here to help you choose the perfect option tailored to your comfort, health and lifestyle needs.

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Designed for deep comfort and better rest, so you wake up refreshed and ready for the day

Yes. The medium feel and Duet coil core keep hips elevated while foam layers ease surface pressure, helping many back-pain sufferers wake refreshed.

Plush upper foams let shoulders and hips sink just enough, while zoned coils keep alignment, making it comfortable for most side sleepers.

Hybrid. It marries NXG memory foam comfort layers with pocketed coils for balanced contour and support.

The 3500 adds extra cooling gel foam, a thicker comfort package, and a higher coil count for enhanced pressure relief and temperature control versus the 2500.

Gel infusion and open-cell design coupled with the CoolFeel cover move heat away, so it sleeps noticeably cooler than traditional memory foam beds.

Yes. Its flexible hybrid build bends smoothly on most adjustable foundations; slats should be under three inches apart.

It’s rated “Medium,” offering a balanced blend of cushioning and push-back suitable for multiple sleep positions.

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