Serta iSeries NXG 3500 13.5 inch firm hybrid mattress in a modern bedroom with cooling cover.
Serta iSeries NXG 3500 13.5 inch firm hybrid mattress in a modern bedroom with cooling cover.
Interior layers of Serta iSeries NXG 3500 firm hybrid mattress showing coil system and support foam.
Interior layers of Serta iSeries NXG 3500 firm hybrid mattress showing coil system and support foam.
Serta iSeries NXG 3500 13.5" firm hybrid mattress with a moisture-wicking cooling fabric cover.
Serta iSeries NXG 3500 13.5" firm hybrid mattress with a moisture-wicking cooling fabric cover.
Front view of the Serta iSeries NXG 3500 firm hybrid mattress highlighting deep 13.5 inch profile.
Front view of the Serta iSeries NXG 3500 firm hybrid mattress highlighting deep 13.5 inch profile.
Side view of Serta iSeries NXG 3500 firm mattress showing high-quality edges and durable construction.
Side view of Serta iSeries NXG 3500 firm mattress showing high-quality edges and durable construction.
Close-up of the cooling geometric pattern on the Serta iSeries NXG 3500 firm hybrid mattress cover.
Close-up of the cooling geometric pattern on the Serta iSeries NXG 3500 firm hybrid mattress cover.
Side sleeper on Serta iSeries NXG 3500 firm hybrid mattress showing spinal alignment and support.
Side sleeper on Serta iSeries NXG 3500 firm hybrid mattress showing spinal alignment and support.
Detail of Serta iSeries NXG 3500 logo on a breathable navy blue hybrid mattress side panel.
Detail of Serta iSeries NXG 3500 logo on a breathable navy blue hybrid mattress side panel.
Serta iSeries NXG 3500 firm hybrid mattress scale, ideal for back sleepers needing a stable surface.
Serta iSeries NXG 3500 firm hybrid mattress scale, ideal for back sleepers needing a stable surface.
Serta iSeries NXG 3500 hybrid mattress diagram showing lumbar support and targeted pressure relief.
Serta iSeries NXG 3500 hybrid mattress diagram showing lumbar support and targeted pressure relief.
Serta iSeries NXG 3500 Hybrid Firm 13.5 Inch Mattress

Brand Serta

$2,299.00
$3,499.00
Save $1,200.00
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Best For

Side & Stomach Sleepers

Firmness

firm Comfort
Only 17 left in stock
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Only 17 left in stock

Will Ship between Apr 25 - Apr 28

5 Years Warranty

5-year non-prorated warranty.
Title

Free USA Wide Delivery

We offer free delivery on orders over $100. Ready to ship in 2-5 business days.

Product Description

To begin with, the mattress greets you with a CoolFeel knit cover that wicks heat and moisture for a fresh first touch. Next, layers of NXG Next Generation Memory Foam and Gel Action memory foam layers deliver firm contouring that many owners call the best 13.5 inch firm mattress for back pain. 

Because these foams rest on a Duet Coil-in-Coil Support System, you gain maximum spinal alignment support while enjoying a touch of bounce that heavy sleepers appreciate. 

Individually wrapped inner and outer springs absorb energy, giving reduced partner motion transfer even when one sleeper turns. A high-density foam encasement steadies every side so you can sit or sleep to the very edge. 

Finally, you can Buy Serta iSeries NXG 3500 online today, claim free USA shipping, flexible Affirm payments, and a risk-free 120-night trial while the holiday sale lasts.

Mattress Size

✅ Twin: Provides a comfortable sleep space for one child or adult.

✅ Dimensions: 39" wide x 75" long.

 

✅ Twin XL: Perfect for taller individuals, ensuring a comfortable sleep.

✅ Dimensions: 39" wide x 80" long.

 

✅ Full: Children, Single Adults, Adults with Children and/or Pets

✅ Dimensions: 54" wide x 75" long.

 

✅ Queen: The most popular size, providing ample space for two adults to sleep comfortably.

✅ Dimensions: 60" wide x 80" long.

 

✅ King: Experience generous space without crowding your partner.

✅ Dimensions: 76" wide x 80" long.

 

✅ California King: Perfect for taller partners, Experience generous space without crowding your partner.

✅ Dimensions: 72" wide x 84" long.

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key mattress benefits
Targeted Pressure Relief

Multiple foam layers, including 5-Zoned Silhouette Foam, distribute pressure evenly and promote breathability for full-body comfort.
Enhanced Lumbar Support

Isotonic memory foam layer provides durable, adaptive support to the lower back, helping maintain healthy spinal alignment.
Motion Isolation & Edge Support

Zoned wrapped coil system minimizes partner disturbance while offering complete edge-to-edge sleeping surface stability.
Durable & Safe Construction

Custom-milled stain-resistant fabric cover adds longevity, while CertiPUR-US® certified foams ensure a healthier, chemical-free sleep environment.

not sure if this is the right mattress for you?

If you're unsure whether this is the perfect mattress for you, don't hesitate to reach out to our sleep experts for personalized recommendations. We're always happy to assist our customers in finding the ideal mattress that fits both their comfort needs and budget.

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Phone Number - 800-540-9851

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Serta iSeries NXG 3500 13.5 inch firm hybrid mattress in a modern bedroom with cooling cover.
Interior layers of Serta iSeries NXG 3500 firm hybrid mattress showing coil system and support foam.
Serta iSeries NXG 3500 13.5" firm hybrid mattress with a moisture-wicking cooling fabric cover.
Front view of the Serta iSeries NXG 3500 firm hybrid mattress highlighting deep 13.5 inch profile.
Side view of Serta iSeries NXG 3500 firm mattress showing high-quality edges and durable construction.
Close-up of the cooling geometric pattern on the Serta iSeries NXG 3500 firm hybrid mattress cover.
Side sleeper on Serta iSeries NXG 3500 firm hybrid mattress showing spinal alignment and support.
Detail of Serta iSeries NXG 3500 logo on a breathable navy blue hybrid mattress side panel.
Serta iSeries NXG 3500 firm hybrid mattress scale, ideal for back sleepers needing a stable surface.
Serta iSeries NXG 3500 hybrid mattress diagram showing lumbar support and targeted pressure relief.

Serta iSeries NXG 3500 Hybrid Firm 13.5 Inch Mattress

$2,299.00