Serta iSeries NXG 3500 13.5-inch medium memory foam mattress in a modern bedroom setting Internal foam layers of the Serta iSeries NXG 3500 mattress for cooling and pressure relief. Serta iSeries NXG 3500 medium mattress set with a matching low-profile foundation for stable support. Angled view of the Serta iSeries NXG 3500 13.5" mattress featuring a geometric cooling cover. Slim side profile of the 13.5-inch Serta iSeries NXG 3500 medium memory foam mattress. Front view of the Serta iSeries NXG 3500 memory foam mattress with a durable navy blue border. Close-up corner of the Serta iSeries NXG 3500 mattress showing the premium quilted cooling fabric. Top-down view of the breathable moisture-wicking cooling cover on the iSeries NXG 3500 mattress. Stylish bedroom featuring the Serta iSeries NXG 3500 medium mattress for balanced sleep comfort. Spinal alignment diagram showing the Serta iSeries NXG 3500 foam layers supporting a side sleeper. Serta iSeries NXG 3500 medium firmness scale, providing a perfect blend of support and comfort. Infographic of iSeries NXG 3500 mattress layers featuring cooling technology and edge-to-edge stability.
Serta iSeries NXG 3500 Medium Memory Foam 13.5 Inch Mattress
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Serta iSeries NXG 3500 Medium Memory Foam 13.5 Inch Mattress

$2,599.00
$3,599.00
Save $1,000.00
Brand: Serta
Size
i Size Guide
$2,599.00
Only 17 left in stock
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10-Year Limited Warranty 10-Year Limited Warranty
100-Night Trial 100-Night Trial

To begin with, the Serta iSeries NXG 3500 Medium Mattress welcomes sleepers with a CoolFeel™ cover that feels cool right away. This fabric teams with gel-infused NXG Next Generation Memory Foam to form a cooling hybrid mattress with NXG memory foam that draws heat away while contouring evenly. 

Next, a layer of transitional comfort foam steadies the body on a Duet coil-in-coil support system, delivering targeted spinal alignment support appreciated by back and side sleepers. Because each inner spring sits inside a second coil, weight is distributed gently yet firmly, and partners notice reduced motion transfer for couples when one person moves. High-density rails strengthen the perimeter so you can sit or sleep right to the edge.

 Finally, you can buy Serta iSeries NXG 3500 online today with free shipping in the USA and Affirm financing, locking in the Memorial savings on this 13.5-inch medium hybrid mattress before stock runs low.

Balanced Medium Comfort

Blends gentle contour with healthy push-back for all sleep positions.

5-Zone Duet Coil Core

Inner and outer springs give precise lift under the shoulders, lumbar, and hips.

Gel + Graphite Cooling

Conductive foams enhance advanced heat dissipation technology for cooler nights.

Motion-Quiet Hybrid Design

Individually wrapped coils isolate movement so partners stay asleep.

Reinforced Foam Edge

High-density encasement stops roll-off and lets you use the whole surface.

Risk-Free Trial & Warranty

120-night trial and 10-year Serta warranty add peace of mind.

Key Mattress Benefits

Serta iSeries NXG 3500 Medium Memory Foam 13.5 Inch Mattress

6 Layers
Of Cooling
Comfort

Breathable knit promotes airflow and keeps the surface fresh.

Gel-infused foam contours deeply while moving heat away for a stable temperature.

High-density layer spreads body weight and protects coils beneath.

Inner micro-coil sits inside an outer coil, delivering adaptive lift and zoned pressure relief.

Robust rails surround the coil unit, ensuring edge-to-edge durability.

Firm bottom foam anchors the entire mattress and reduces vibration.

Serta iSeries NXG 3500 Medium Memory Foam 13.5 Inch Mattress
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Designed for deep comfort and better rest, so you wake up refreshed and ready for the day

It is a hybrid that blends NXG memory foam layers with a Duet coil-in-coil spring core for balanced comfort and support.

Yes. The medium feel combines lifting coils with contouring foam to keep the spine aligned, which may ease lower-back tension.

Gel infusion, graphite additives, and a CoolFeel cover help carry heat away, creating a noticeably cooler surface versus standard memory foam.

Yes. Its flexible foam-and-coil construction articulates smoothly on most modern adjustable foundations.

Cloudy lists this model as Medium Comfort, offering a balanced blend of support and cushioning suitable for multiple sleep positions.

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