The Perfect Sleeper X™ Hybrid Mattress offers Xtra comfort, Xtra support zones, Xtra pressure relief, Xtra premium memory foam, Xtra cooling technology, and ultimately, Xtraordinary sleep.
Experience the perfect balance of comfort and support with the Serta® iSeries® NXG™ 3500 Medium Foam Mattress, where next-generation sleep technology meets versatile all-foam design. This intelligently crafted mattress delivers immediate cooling relief, instant pressure relief, and ideal medium support that adapts beautifully to all sleep positions—creating the perfect sleep foundation for side, back, and stomach sleepers seeking balanced comfort. Featuring innovative high-density NXG Memory Foam technology and advanced cooling systems, this medium-firm mattress creates a harmonious sleep experience that cradles your body while maintaining proper spinal alignment. Discover how premium memory foam, dual-layer cooling technology, and Ultimate Edge™ Support work together to deliver nights of deeper, more restorative sleep with exceptional contouring comfort.


Experience refreshing sleep from the moment you lie down with immediate cooling technology that eliminates heat buildup before it disrupts your rest. The CoolFeel™ Cover delivers that instantly refreshing cool-to-the-touch sensation that helps your body transition into sleep mode faster, eliminating the uncomfortable warmth that can delay sleep onset and interrupt your restful nights.
Working seamlessly with the cover, Carbon Fiber Memory Foam continuously pulls heat away from your body throughout the night, effectively redistributing warmth and maintaining a balanced sleep temperature. This integrated dual-layer cooling approach keeps you comfortably cool from bedtime through morning, transforming hot, restless nights into refreshing, uninterrupted sleep experiences.

The 3500 Medium Foam incorporates innovative NXG™ Memory Foam—a premium, high-density memory foam that delivers exceptional contouring pressure relief while maintaining balanced medium support your body requires. This advanced foam technology adapts to your body's natural contours, distributing weight evenly and eliminating pressure points that can cause discomfort, all while providing the medium foundation essential for proper spinal alignment across all sleep positions.
Ideal for side, back, and stomach sleepers who need versatile support, the NXG Memory Foam contours to your unique shape with just the right amount of give. The medium feel ensures your spine stays properly aligned while pressure-sensitive areas like your shoulders, hips, and lower back receive the relief they need. This creates a sleep surface that supports your body's natural posture while eliminating the pressure points that can disrupt restorative sleep.

The premium high-density foam core represents a sophisticated approach to all-foam mattress support. This intelligent design features a durable, consistent support foundation that works throughout the entire mattress to maintain proper spinal alignment and body positioning. Unlike traditional foam mattresses that can lose support over time, this high-density core ensures lasting performance and consistent comfort.
Your entire body benefits from the balanced medium support that adapts to your natural curves while maintaining proper alignment. This precision-engineered approach ensures every part of your body receives the ideal level of support, promoting healthy sleep posture and reducing the morning stiffness or discomfort that can result from improper alignment. The all-foam construction provides a smoother, more body-hugging feel that contours closely to your shape.

Enjoy the tranquility of undisturbed sleep with the 3500 Medium Foam's sophisticated motion control design. The strategic combination of memory foam layers works harmoniously to absorb and minimize the impact of your partner's movements, ensuring that nighttime activity doesn't disrupt your restful sleep.
This motion-isolating technology proves especially valuable for couples with varying sleep schedules or different movement patterns. The all-foam construction excels at absorbing motion, meaning whether your partner rises early, shifts positions frequently, or gets in and out of bed during the night, you'll experience uninterrupted sleep thanks to the mattress's ability to contain and isolate motion within individual sleeping zones.

Ultimate Edge™ Support technology guarantees that every square inch of your mattress delivers consistent support and stability, from the center to the very perimeter. This advanced edge support system prevents the sagging and compression common in traditional foam mattresses, maximizing your usable sleep surface and providing a solid, stable edge for sitting or sleeping near the perimeter.
Whether you prefer sleeping near the edge, need additional space for stretching out, or simply value the confidence of knowing your mattress maintains its shape over time, Ultimate Edge™ Support provides lasting edge-to-edge stability. This technology ensures your mattress preserves its support characteristics throughout its entire lifespan, delivering consistent comfort and medium firmness wherever you choose to sleep.

The iSeries NXG 3500 Medium Foam is CertiPUR-US® Certified, ensuring all foam components undergo rigorous testing and verification to be free from harmful chemicals and gasses. This certification confirms that your mattress meets stringent standards for content, emissions, and durability, giving you complete confidence in the materials you sleep on every night.
This dedication to responsible manufacturing means you can sleep soundly knowing your mattress delivers not only exceptional comfort and support but also uncompromising safety for you and your family. The CertiPUR-US® certification reflects a commitment to quality, safety, and environmental responsibility that goes beyond comfort to encompass your complete health and well-being.
79.5"L x 39"W x 13.5"H
Weight: 94.62 lbs
74.5"L x 54"W x 13.5"H
Weight: 120.11 lbs
79.5"L x 60"W x 13.5"H
Weight: 140.01 lbs
79.5"L x 60"W x 13.5"H
Weight: 141.25 lbs
79.5"L x 76"W x 13.5"H
Weight: 175.69 lbs
83.5"L x 72"W x 13.5"H
Weight: 174.95 lbs
79.5"L x 76"W x 13.5"H
Weight: 174.56 lbs
The Serta® iSeries® NXG™ 3500 Medium Foam Mattress represents exceptional versatility in next-generation sleep innovation, combining premium all-foam comfort with balanced medium support. This medium-firm design expertly delivers immediate cooling comfort, targeted pressure relief, and ideal support, specifically engineered for all sleep positions—side, back, and stomach sleepers who require balanced spinal alignment without sacrificing comfort or temperature regulation.
With its innovative NXG Memory Foam, advanced dual-layer cooling technology, and premium high-density foam core, the 3500 Medium Foam delivers a sleep experience that cradles your body's natural contours while maintaining proper alignment. The Ultimate Edge™ Support ensures lasting edge-to-edge stability, while CertiPUR-US® certification provides complete confidence in the quality and safety of your investment. Protected by a 100-night in-home trial and 10-year limited warranty, this mattress offers the ideal combination of balanced medium support, cooling comfort, and exceptional all-foam contouring in your purchase decision.
Serta® mattresses or foundations used with proper support are protected by a 10 year limited manufacturer’s warranty. Serta products are warrantied against manufacturing defects in workmanship and material (excluding covers and handles, except for handles on iSeries and equivalent level mattresses).
The warranty coverage runs from the original date of purchase. Replacement of the mattress or foundation does not extend its limited warranty or begin a new limited warranty period. Your warranty period is based on the code printed on your white law label as indicated on the Warranty Code Chart. The duration of any applicable implied warranties, including but not limited to the implied warranties of merchantability and fitness, shall not exceed the term of this limited warranty. (Some states do not allow limitations on how long an implied warranty lasts, so this limitation may not apply to you.) Serta® shall not be liable for incidental or consequential damages that result from the use of your Serta® product. (Some states do not allow the exclusion or limitation of incidental or consequential damages, so this exclusion may not apply to you.) No expressed or implied warranties are extended to persons who purchase the product from anyone other than Serta Simmons Bedding Company or its authorized dealers, and all warranties to such persons, including the implied warranties of merchantability and fitness, are hereby excluded.
If your Serta® mattress or foundation fails due to a manufacturing defect, the exclusive remedy under this warranty will be replacement of the defective product in the U.S., Puerto Rico or U.S. Virgin Islands. If the Serta® product you purchased is discontinued at the time of replacement, a current model of comparable quality and value will be selected. To receive service under the terms of this warranty contact your original Serta® dealer. If your original Serta® dealer is no longer in business or you have moved outside the service area, please contact Serta Customer Service at 1-888-55-SERTA (1-888-557-3782) between the hours of 9am to 5pm EST Monday - Friday. A copy of original bill of sale is needed to determine original date of purchase. Model name label and law label must be provided to identify the bedding and validate this warranty.
This warranty gives you specific rights, and you may have other rights, which vary from state to state. This warranty is extended only to the original purchaser from Serta Simmons Bedding Company or its authorized dealers.
The Perfect Sleeper X™ Hybrid Mattress offers Xtra comfort, Xtra support zones, Xtra pressure relief, Xtra premium memory foam, Xtra cooling technology, and ultimately, Xtraordinary sleep.
Zoned Support refers to ergonomically designed support zones within the mattress that feature alternating levels of firmness. These zones are crafted to maintain your body's natural alignment during sleep by providing enhanced support where the body naturally curves and ensuring comfort where the body contacts the mattress the most.
The 5 ZoneActive™ Design is engineered to maintain your natural alignment throughout the night. It provides enhanced support where your body naturally curves, such as the lower back and upper thighs, and ensures comfort at key contact points like the shoulders, hips, and lower legs.
Yes, the mattress incorporates the CoolFeel™ System, which keeps you comfortable throughout the night by promoting a cooler sleep environment.
No, the Perfect Sleeper X™ Hybrid Mattress does not contain any fiberglass, ensuring a safe and comfortable sleep environment. :contentReference[oaicite:0]{index=0}
The Perfect Sleeper X™ Hybrid Mattress is available in multiple comfort levels, including Firm, Medium Firm, Medium, and Plush, allowing you to choose the firmness that best suits your sleep preferences. :contentReference[oaicite:1]{index=1}
Yes, the Perfect Sleeper X™ Hybrid Mattress is compatible with most frames, including traditional frames, box springs, platform frames, slatted frames, bunky boards, and adjustable frames, providing flexibility to suit your setup. :contentReference[oaicite:2]{index=2}
To protect your mattress from stains and spills, it's recommended to use a mattress protector. For cleaning, avoid applying liquids directly; instead, apply baking soda to the soiled area, let it stand for about 15 minutes, then vacuum. Repeat as needed. Airing out the mattress regularly helps maintain freshness. :contentReference[oaicite:3]{index=3}