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Serta iSeries NXG 3500 Hybrid Firm Mattress

$2,599.00
$2,599.00
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Featuring high-density NXG™ Memory Foam, Serta® Support Foam, and our Q4™ Zoned Support System with Micro Coils for even weight distribution and boosted pressure relief. CoolFeel® Plus System, featuring Carbon Fiber Memory Foam, offers increased cooling by drawing heat away from the body for all-night comfort.

  • The Q4™ Zoned Support System with Micro Coils delivers firm, responsive support and even weight distribution.
  • The CoolFeel® Plus System and Carbon Fiber Memory Foam increase cooling by drawing heat away from the body.
  • High-density NXG™ Memory Foam and Micro Coils boost pressure relief while keeping a firm feel.
Mattress height
14 in
Sleep type
Back sleepers; Stomach sleepers
Mattress type
Hybrid Mattress
Comfort feel
Firm

Firmness Scale

7.0

  1. 1–3 Plush
  2. 3–4 Medium Plush
  3. 4–6 Medium
  4. 6–8 Medium Firm
  5. 8–9 Firm
  6. 9–10 Extra Firm
Bedding size

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Subtotal
$2,599.00

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Certifications

Certification details vary by brand and model. A SleepCity expert can help confirm materials, foams, and manufacturer-backed claims for this exact product before you purchase.

Delivery & Returns

SleepCity serves Southeast Texas and Southwest Louisiana with local delivery on selected mattress purchases. We will confirm delivery timing, setup options and pickup availability before checkout. All sales are final; no refunds. Qualifying mattresses delivered within our regular local delivery areas may be eligible for one comfort exchange within 120 nights, after a minimum 30-night break-in period. A $249 exchange fee applies. See our Return & Comfort Guarantee Policy for all eligibility requirements and exclusions.

Outside our local delivery area? Call (903) 747-8270 for delivery options.

Warranty

Warranty coverage is provided by the manufacturer and varies by product. SleepCity can help compare coverage, confirm what is included, and point you to the right registration details.

Why SleepCity?

SleepCity pairs trusted mattress brands with local showroom guidance, financing help, and delivery support, so the experience stays clear from selection through setup.

Inside the iSeries NXG 3500 Firm

See how the iSeries NXG 3500 Firm layers the CoolFeel® Plus System, NXG™ Memory Foam, and Micro Coils over the Q4™ Zoned Support System for a premium firm feel.
Serta iSeries NXG 3500 Hybrid Firm Mattress construction

  1. CoolFeel® Plus Cover + Carbon Fiber Memory Foam

    The CoolFeel® Plus System with Carbon Fiber Memory Foam draws heat away for increased, all-night cooling.

  2. NXG™ Memory Foam + Micro Coils

    High-density NXG™ Memory Foam and Micro Coils add responsive contouring and boosted pressure relief with a firm feel.

  3. Q4™ Zoned Support System + Serta® Support Foam

    The Q4™ Zoned Support System and Serta® Support Foam distribute weight evenly for firm, aligned support.

OVER 5,000 CUSTOMER REVIEWS

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Delivery and setup options for Southeast Texas and Southwest Louisiana.

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