King Size Serta iSeries NXG 3500 Firm Hybrid Mattress

Serta iSeries NXG 3500 Firm Hybrid King Mattress — Advanced Support, Cooling Comfort & Edge-to-Edge Stability

Upgrade to a bigger, better night’s sleep with the Serta iSeries NXG 3500 Firm Hybrid King Mattress, available today at Gallery Furniture with Free, Free, Free Same-Day Delivery across the Houston area. This king-size hybrid mattress combines firm, targeted support with advanced cooling and motion control — perfect for couples or back and stomach sleepers who demand comfort, durability, and reliable full-body alignment.

Key Features

Firm Feel for Balanced Support
Designed for those who prefer a stable and supportive feel, this firm hybrid delivers the perfect blend of strength and comfort through Serta’s legendary craftsmanship.

5-Zone Coil Support System
The 5-Zone Support System targets key areas — head, shoulders, lumbar, hips, and legs — to promote healthy spinal alignment and reduce strain. Reinforced with BestEdge® Foam Encasement, it offers edge-to-edge stability across the full width of this King mattress, maximizing usable sleep space for couples.

Premium Pressure Relief
High-density, premium memory foam layers contour gently to the body, reducing pressure points while maintaining the firm feel sleepers love. This design supports long-term back comfort and restorative rest.

CoolFeel™ Cover & Carbon Fiber Memory Foam
Enjoy a refreshing, temperature-balanced sleep with Serta’s CoolFeel™ Cover, which feels cool to the touch, and Carbon Fiber Memory Foam, which channels heat away from your body for a cooler night’s rest — ideal for warm Houston nights.

Motion Control Technology
Individually wrapped coils isolate movement, minimizing partner disturbance. Perfect for couples with different schedules or sleep styles.

Ideal for Back and Stomach Sleepers
The firm comfort level ensures your spine stays properly aligned while preventing excess sinkage — making it a great fit for stomach and back sleepers who need lasting support.

Why Buy from Gallery Furniture

• Buy Today, Sleep Tonight — Free, Free, Free Same-Day Delivery across Houston and nearby communities

• Free Haul-Off of your old mattress (haul-off applies to replacement items only)

• Professional Set-Up by Gallery Furniture’s own in-house delivery team — no third-party crews

• Trusted Local Service before, during, and after the sale

Customer Reviews

⭐️⭐️⭐️⭐️⭐️ “This King-size iSeries mattress gives both of us plenty of room and the firm feel we love. Gallery Furniture’s same-day delivery and setup were outstanding!” – Daniel & Laura C., Houston, TX

⭐️⭐️⭐️⭐️⭐️ “The firm support has helped my back pain tremendously, and the cooling cover keeps us comfortable all night. Top-notch service from Gallery Furniture!” – Jorge M., Spring, TX

FAQs

Q: Does the NXG 3500 Firm Hybrid work with adjustable bases?
A: Yes — it’s fully compatible with Gallery Furniture’s Flex and Ease Adjustable Bases, which add head and foot articulation for zero-gravity comfort.

Q: Will this mattress sleep hot?
A: No — the CoolFeel™ Cover and Carbon Fiber Memory Foam help draw heat away from your body for a cooler, more comfortable sleep.

Q: Who should choose the firm model?
A: This mattress is best for back and stomach sleepers seeking a stable, supportive surface that promotes spinal alignment.

Q: Is this mattress made in the USA?
A: Yes — the Serta iSeries NXG 3500 Firm Hybrid is proudly designed and assembled in America for long-lasting quality and durability.