Name: Serta® iSeries NXG™ 13.5" Hybrid 3500 Firm Smooth Top Split Head King Mattress
Brand: Serta
SKU: 1875751
Price: 4199.99 USD
Availability: InStock
Rating: 4.9 (15 reviews)

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Serta® 2" Twin Bunkie Board

Twin Low FoundationElevate your bed’s performance with a high-quality bunkie board. Crafted for strength and stability, it delivers firm, even support that enhances mattress comfort and extends its lifespan. Its sleek, low-profile design fits perfectly on bunk beds, platform frames, and daybeds—giving you a smoother sleep surface and a cleaner, more modern bedroom setup.

Serta® 2" Full Bunkie Board

Elevate your bed’s performance with a high-quality bunkie board. Crafted for strength and stability, it delivers firm, even support that enhances mattress comfort and extends its lifespan. Its sleek, low-profile design fits perfectly on bunk beds, platform frames, and daybeds—giving you a smoother sleep surface and a cleaner, more modern bedroom setup.

Serta® 2" Twin XL Bunkie Board

Serta® 2" King Bunkie Board. Includes 2 Pieces

Serta® 2" Queen Bunkie Board

Serta® 2" California King Bunkie Board

Serta® 2" Split Queen Bunkie Board, Includes 2 Pieces

Serta® iSeries NXG™ 12" Memory Foam Luxury 1500 Firm Smooth Top Twin XL Mattress

Experience a series of benefits delivering immediate cooling, instant pressure relief, and ideal support for a deeper, more restful sleep at a price that makes sense. Featuring high-density memory foam, NXG™ memory foam for deep, contouring pressure relief.

Serta® iSeries NXG™ 12" Hybrid 1500 Firm Smooth Top Queen Mattress

Serta® iSeries NXG™ the next generation of comfort. Designed with a series of benefits for the sleep you want. Experience immediate cooling, instant pressure relief, and ideal support for a deeper, more restful sleep at a price that makes sense.

Serta® iSeries NXG™ 12" Hybrid 1500 Firm Smooth Top King Mattress

Serta® iSeries NXG™ 12" Hybrid 1500 Firm Smooth Top California King Mattress

Serta® iSeries NXG™ 13.5" Hybrid 3500 Firm Smooth Top Split Head King Mattress-1

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Serta Mattress Warranty (1).pdf

Mattress Delivery What To Expect with Captions

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Relocate Product

Serta® iSeries NXG™ 13.5" Hybrid 3500 Firm Smooth Top Split Head King Mattress

Meets federal fire retardant safety standard

A 5-zoned coil system offers targeted support for your back and body with BestEdge® Support for lasting, edge-to-edge mattress stability

Innovative, high-density, premium memory foam for deep, contouring pressure relief

Topped with a cool-to-the-touch CoolFeel™ Cover and Carbon Fiber Memory Foam draws heat away from the body

Designed to minimize the impact of your partner's movement

This firm feel mattress with a series of benefits for the sleep you want. Experience immediate cooling, instant pressure relief, and ideal support for a deeper, more restful sleep at a price that makes sense. High-density NXG™ Memory Foam provides deep, contouring pressure relief. A cool-to-the-touch cover offers immediate cooling, while Carbon Fiber Memory Foam draws heat away from the body for all-night comfort. The hybrid models feature a 5-zone coil system with alternating firm and plush areas to better support the curves of your back and body.

CertiPUR-US® Certified means our foam was tested for and is free from harmful chemicals and gasses

To protect your mattress from stains and spills, we highly recommend using a mattress protector; This will also help with the overall health and lifespan of your mattress.

We do not recommend applying liquids to the product; Applying liquids may stain the fabric and make the soiled area worse; Moisture or chemicals applied directly to the mattress can cause premature breakdown of the foam and damage the product.

We suggest applying baking soda to the soiled area, let stand about 15 minutes, vacuum, and repeat as needed; Air the product out as much as possible.

Serta iSeries NXG mattresses are compatible with most frames, including: traditional frames, box springs, platform frames, slatted frames, bunky boards, and adjustable frames.

A split head adjustable base is required for split head mattresses.

Serta has been in the sleep industry for over 90 years and has been dedicated the entire time to helping people like you find a solution to your sleep problems so you can finally sleep better than you ever have. We love helping people find their best sleep and this is why our brand exists.

We believe that mattress shopping shouldn’t be stressful. We also believe whether you are buying online or in-store, you should be comfortable during the entire purchase process. So no matter if you're a back, stomach or side sleeper or if you sleep at night or during the day, we have a product to help you get the sleep you deserve.

*Mattress only, all other products sold separately. Images may not depict actual size.

Serta Presidents Day 2026 Promo

Serta® iSeries NXG™ 12.5" Hybrid 2500 Medium Smooth Top Twin XL Mattress

Serta® iSeries NXG™ 12.5" Hybrid 2500 Medium Smooth Top Full Mattress

Serta® iSeries NXG™ 12.5" Hybrid 2500 Medium Smooth Top Queen Mattress

Serta® iSeries NXG™ 12.5" Hybrid 2500 Medium Smooth Top King Mattress

Serta® iSeries NXG™ 12" Memory Foam Luxury 1500 Firm Smooth Top Full Mattress

Serta® iSeries NXG™ 12" Memory Foam Luxury 1500 Firm Smooth Top Queen Mattress

Serta® iSeries NXG™ 12" Memory Foam Luxury 1500 Firm Smooth Top King Mattress

Serta® iSeries NXG™ 12" Memory Foam Luxury 1500 Firm Smooth Top California King Mattress

Serta® iSeries NXG™ 12.5" Hybrid 2500 Medium Smooth Top California King Mattress

Serta® iSeries NXG™ 12.5" Hybrid 2500 Plush Smooth Top Twin XL Mattress

Serta® iSeries NXG™ 12.5" Hybrid 2500 Plush Smooth Top Full Mattress

Serta® iSeries NXG™ 12.5" Hybrid 2500 Plush Smooth Top Queen Mattress

Serta® iSeries NXG™ 12.5" Hybrid 2500 Plush Smooth Top King Mattress

Serta® iSeries NXG™ 12.5" Hybrid 2500 Plush Smooth Top California King Mattress

Serta® iSeries NXG™ 12" Hybrid 1500 Firm Smooth Top Twin XL Mattress

Serta® iSeries NXG™ 12" Hybrid 1500 Firm Smooth Top Full Mattress

Premium, high-density foam core surrounded with Ultimate Edge™ Support for lasting, edge-to-edge mattress stability

This firm mattress offers a series of benefits for the sleep you want. Experience immediate cooling, instant pressure relief, and ideal support for a deeper, more restful sleep at a price that makes sense.  High-density NXG™ Memory Foam delivers deep, contouring pressure relief. A cool-to-the-touch cover offers immediate cooling, while Carbon Fiber Memory Foam draws heat away from the body for all-night comfort. Plus, a high-density foam core provides durable support.

This medium feel mattress with a series of benefits for the sleep you want. Experience immediate cooling, instant pressure relief, and ideal support for a deeper, more restful sleep at a price that makes sense. High-density NXG™ Memory Foam provides deep, contouring pressure relief. A cool-to-the-touch cover offers immediate cooling, while Carbon Fiber Memory Foam draws heat away from the body for all-night comfort. The hybrid models feature a 5-zone coil system with alternating firm and plush areas to better support the curves of your back and body.