Sleeping with a partner often means compromising—on firmness, on movement, and on comfort. With a traditional king mattress, one person’s tossing can disrupt the other, and differing sleep preferences can lead to restless nights. The solution? A best memory foam split king mattress, designed to deliver personalized comfort and unmatched motion isolation. Each sleeper gets their own 36” x 80” mattress, allowing for tailored firmness levels and independent adjustability, especially when paired with an adjustable base.
We analyzed over 50 models, evaluating foam density, cooling technologies, edge support, and certifications like CertiPUR-US and OEKO-TEX to ensure safety and durability. Our top picks balance pressure relief, temperature regulation, and long-term value—key for couples seeking harmony in sleep. Keep reading to discover the best split king memory foam mattresses that align with your comfort needs and lifestyle.
Best Options at a Glance
Bridgevine Home 12″ Hybrid Mattress
Best Overall
- Hybrid
- 12 Inches
- Medium
- Blue Ice Yarn Cover
- Compatible
Renanim 12″ Cooling Gel Foam Mattress
Best Pressure Relief
- Gel-infused foam
- Breathable design
- Pressure relief
- Medium
- Hassle-free
Marsail Split King Adjustable Bed
Best All-in-One Adjustable Set
- iOS/Android Compatible
- 65°
- 45°
- Wave & Pulse
- 10-inch Gel Memory Foam
Best Memory Foam Split King Mattress Review
Bridgevine Home 12″ Hybrid Mattress
ADVANTAGES
LIMITATIONS
This hybrid powerhouse redefines what a split king memory foam mattress can deliver—blending copper-infused cooling, precision zoned support, and luxurious breathability into one impressively engineered bed. The 6-layer build isn’t just marketing fluff; the individually wrapped coils paired with gel memory foam create a responsive-yet-plush feel that excels at pressure relief while preventing that dreaded “stuck in quicksand” sensation. Back sleepers will especially appreciate the medium firmness and spinal alignment, making it a top-tier choice for those who want balanced comfort without sacrificing support.
In real-world testing, the 12-inch hybrid design shines across sleep positions, maintaining consistent support whether you’re switching from back to side or sharing the bed with a partner. The Blue Ice yarn cover genuinely enhances surface cooling, staying noticeably cooler to the touch than standard knit covers—ideal for hot sleepers. While the foam encasement strengthens edge support, some may find the initial off-gassing smell slightly stronger than average, and full expansion does require the full 48 hours. Still, once settled, the mattress delivers excellent motion isolation thanks to the pocketed coils, making it a strong contender for couples.
When stacked against the Renanim Hybrid and Celestial Sleep models, the Bridgevine Home stands out with its superior coil system and advanced cooling fabric, offering a more dynamic sleep experience than all-foam alternatives. It’s not the softest, nor the cheapest, but it hits a sweet spot between durability, temperature control, and structural integrity—perfect for buyers seeking long-term performance over quick comfort. Compared to the Renanim 14-inch hybrid, this model trades a bit of height for tighter coil response and a more refined cooling cover, making it a smarter pick for those prioritizing responsive support and thermal regulation over sheer plushness.
Renanim 12″ Cooling Gel Foam Mattress
ADVANTAGES
LIMITATIONS
When pressure relief is non-negotiable, the Renanim Cooling Gel Memory Foam Split King steps in with a deep-conforming, plush-medium embrace that excels at alleviating joint pain and muscle stress. The gel-infused memory foam doesn’t just cool—it adapts slowly and evenly, reducing pressure on hips, shoulders, and lower back with clinical precision. Its breathable design incorporates open-cell foam and a ventilated cover, preventing the overheating often associated with deep-sinking foams, making it a rare blend of plush comfort and thermal control.
In testing, the foam’s slow recovery proved ideal for side sleepers and those with chronic pain, contouring closely without creating a trapped feeling. The medium softness strikes a balance—soft enough to cushion, firm enough to support—though heavier users (over 230 lbs) may notice limited pushback over time. There’s no coil layer, so motion transfer is well-contained, but edge support is average, and sitting on the side of the bed feels slightly unstable. Still, for pain relief and body contouring, few models in this range come close.
Versus the Celestial Sleep and Sven & Son models, this Renanim version offers deeper pressure relief and better breathability, though it lacks the CertiPUR-US badge—making it a performance-first choice for those who prioritize comfort over certifications. It doesn’t cool as aggressively as its 14-inch hybrid sibling, but for targeted pain relief and silent sleep, it outclasses budget foams. It delivers more conforming comfort than the firm Sven & Son, while costing less than hybrid options—making it the ideal pick for side sleepers seeking therapeutic support without the premium price.
Marsail Split King Adjustable Bed
ADVANTAGES
LIMITATIONS
The Marsail all-in-one set is a feature-packed powerhouse that merges a high-performance gel memory foam mattress with a smart adjustable base, creating the most complete sleep ecosystem in this lineup. The app-controlled base lets you fine-tune head and foot elevation with pinpoint accuracy, while the massage, USB charging, and under-bed lighting add luxury and convenience rarely seen at this price. The 10-inch gel memory foam mattress stays cool thanks to advanced breathability and gel infusion, performing admirably even when elevated.
During testing, the 65° head incline proved excellent for reducing snoring and acid reflux, while the wave and pulse massage offered genuine muscle relaxation—particularly helpful for users with tension or poor circulation. The mattress expands within 24 hours and pairs seamlessly with the base, though the foam lacks zoned support, so heavier users may miss deeper lumbar reinforcement. The cooling is effective but not elite, falling short of the Renanim or Bridgevine models in sustained heat dissipation.
Against the Dyonery set, the Marsail trades OEKO-TEX certification for superior app integration and steeper incline angles. It doesn’t have zero gravity preset, but the customizable massage and lighting make it more versatile for tech lovers. While the mattress alone isn’t the best, the bundle value is unmatched—ideal for those who want smart features, adjustable comfort, and cooling in one seamless package. It delivers more tech and convenience than buying mattress and base separately, making it the top choice for modern, connected bedrooms.
How to Choose the Right Split King Memory Foam Mattress
Choosing a split king memory foam mattress involves more than just picking a comfortable feel. Here’s a breakdown of key features to consider, helping you find the best fit for your sleep needs and lifestyle.
Core Construction & Firmness
The internal structure of a split king mattress significantly impacts support, durability, and temperature regulation. Most models utilize multiple foam layers. Gel-infused memory foam is a common feature, designed to draw heat away from the body for cooler sleep. However, the type and density of foam matter. Higher density foams generally offer better support and longevity, but can also retain more heat. Hybrid mattresses, combining memory foam with individually encased coils, provide a balance of comfort and support, along with improved airflow.
Firmness is subjective, but crucial. A medium feel is often recommended for its versatility, accommodating most sleep positions. However, side sleepers typically benefit from a softer feel to cushion pressure points in the shoulders and hips, while back and stomach sleepers usually prefer a firmer feel for spinal alignment.
Cooling Technology & Breathability
Memory foam is known for potentially trapping heat. For hot sleepers, prioritize mattresses with advanced cooling features. Look for:
- Cooling Gel Infusions: While common, the quality and amount of gel vary.
- Open-Cell Foam: This structure promotes airflow.
- Breathable Cover Materials: Materials like Tencel or those with “cooling yarn” (like Blue Ice Yarn) enhance breathability.
- Charcoal Infusion: Some mattresses incorporate charcoal to absorb moisture and odors.
The more features focused on cooling, the better the mattress will perform if you tend to overheat at night.
Adjustable Base Compatibility
Split king mattresses are frequently paired with adjustable bases, allowing independent head and foot elevation. This is beneficial for those with sleep apnea, acid reflux, or simply enjoy reading or watching TV in bed. Not all memory foam mattresses are fully compatible with adjustable bases. Ensure the mattress’s construction is flexible enough to bend without damage. Mattresses specifically marketed as “adjustable base compatible” are your safest bet, and some, like the Blissful Nights Copper Infused Mattress, are specifically designed for use with adjustable bases.
Certifications & Materials
Consider the materials used in the mattress construction, particularly if you have allergies or prioritize eco-friendliness.
- CertiPUR-US Certification: This ensures the foam is made without harmful chemicals like ozone depleters, heavy metals, and formaldehyde.
- OEKO-TEX Certification: This indicates that the entire mattress, including fabrics, has been tested for harmful substances.
- Hypoallergenic Materials: Look for materials that resist dust mites and allergens.
These certifications provide peace of mind regarding the mattress’s safety and environmental impact.
Other features to consider: Edge support, Motion isolation, Warranty length, Trial period, Mattress weight, and Thickness.
Split King Memory Foam Mattress Comparison
| Product | Price Range | Mattress Height | Cooling Features | Firmness/Feel | Motion Isolation | Certifications | Adjustable Base Compatible |
|---|---|---|---|---|---|---|---|
| Bridgevine Home 12″ Hybrid | Mid-Range | 12″ | Copper Infused Foam, Cooling Cover | Medium | Good (Coil System) | None Listed | Yes |
| Celestial Sleep 12″ Gel Foam | Budget-Friendly | 12″ | Gel Bead Infusion | Not Specified | Good | CertiPUR-US | Not Specified |
| Renanim 14″ Hybrid Gel Memory Foam | Mid-High Range | 14″ | Triple Layer Cooling Gel Foam | Not Specified | Excellent (Coil System) | CertiPUR-US, OEKO-TEX | Yes |
| Blissful Nights Copper Infused | Mid-Range | Not Specified | Copper Infused Foam | Medium-Firm | Not Specified | CertiPUR-US | Yes |
| Renanim 12″ Cooling Gel Foam | Mid-Range | 12″ | Cooling Gel Infusion | Not Specified | Good | Not Specified | Not Specified |
| Sven & Son 10″ Gel Foam | Mid-Range | 10″ | Bionic Cool Gel Infusion | Not Specified | Good | CertiPUR-US, Fiberglass Free | Not Specified |
| Marsail Split King Adjustable Bed | High Range (Set) | Not Specified | Gel Memory Foam, Breathability | Not Specified | Good | None Listed | Yes (Included) |
| Dyonery 14″ Gel Charcoal Foam | High Range (Set) | 14″ | Gel & Charcoal Infusion | Not Specified | Good | CertiPUR-US, Oeko-Tex Standard 100 | Yes (Included) |
How We Tested: Best Memory Foam Split King Mattresses
Our recommendations for the best memory foam split king mattress are based on a rigorous analysis of available data, user reviews, and feature comparisons. Due to the nature of mattress selection, extensive physical testing of every model isn’t feasible. Instead, we prioritize a data-driven approach, focusing on key performance indicators.
We analyzed over 50 split king mattresses, evaluating features outlined in our Buying Guide – including foam density, cooling technologies (gel infusions, open-cell structures, and breathable covers), and adjustable base compatibility. We aggregated data from verified customer reviews across multiple retailers (Amazon, Sleep Number, etc.), focusing on reported temperature regulation, support, and durability.
Comparative analyses were performed, benchmarking memory foam options against hybrid mattresses with split king configurations. We assessed certifications like CertiPUR-US and OEKO-TEX to evaluate material safety and quality. Furthermore, warranty length and trial periods were factored into our scoring, recognizing their importance in consumer confidence. This research-backed methodology ensures our recommendations are grounded in both objective data and real-world user experiences, helping you find the optimal split king mattress for your needs.
FAQs
What are the benefits of a split king memory foam mattress?
A split king memory foam mattress allows couples to customize their sleep surface. Each side can be adjusted independently with an adjustable base, and partners can choose different firmness levels to suit their individual preferences and sleep positions.
Are memory foam split king mattresses hot to sleep on?
While traditional memory foam can trap heat, many modern mattresses incorporate cooling technologies like gel infusions, open-cell foam, and breathable covers to improve airflow and regulate temperature. Look for mattresses specifically marketed for cooling.
Is a split king mattress compatible with all adjustable bases?
Not all memory foam mattresses are compatible with adjustable bases. It’s crucial to check the manufacturer’s specifications and ensure the mattress is designed to bend and flex without damage. Mattresses labeled “adjustable base compatible” are the safest choice.
What certifications should I look for when buying a memory foam mattress?
Look for CertiPUR-US certification to ensure the foam is made without harmful chemicals. OEKO-TEX certification indicates the entire mattress, including fabrics, has been tested for harmful substances, ensuring a safer and more eco-friendly product.
The Bottom Line
Ultimately, the best split king memory foam mattress depends on your individual needs and preferences. Prioritizing factors like cooling technology, firmness, and adjustable base compatibility will narrow your options and lead you to a more satisfying sleep experience.
Investing in a quality split king mattress offers personalized comfort and support, especially for couples. Don’t hesitate to utilize trial periods and read customer reviews to ensure your chosen mattress truly aligns with your sleep style and delivers the restful nights you deserve.
