Split Head Summit Hybrid Medium Mattress — 15", CoolStream Fabric, Titanium Memory Foam, Ice Flex Cooling, 7-Series Pocketed Coils | From $1,734.75
MATTRESSES & TOPPERS · MATTRESSES & ACCESSORIES
CoolStream Fabric. High Density Titanium Memory Foam. Ice Flex Cooling Bands. CertiPUR Comfort Layer. 7-Series Individually Pocketed Coils. Foam Encased. The Split Head Summit Hybrid Medium — A 15" Cooling Hybrid in King and Eastern King Built for Couples With Different Head Elevation Needs.
Available in California King · Eastern King only · 15" profile · Medium comfort · Split head design — each side adjusts independently · CoolStream fabric cover · High density titanium memory foam · Ice Flex Cooling Bands · CertiPUR comfort layer · 7-Series individually pocketed coil system · Foam encasement · GreenGuard Gold certified · 20-year warranty · Bed-in-Box · $1,734.75
Quick Answer: The Split Head Summit Hybrid Medium is a 15" California King and Eastern King hybrid mattress with a split head design — the head section is divided down the centre, allowing each partner to independently adjust their head and upper body elevation via a compatible adjustable base. CoolStream fabric cover, high density titanium memory foam, Ice Flex Cooling Bands, CertiPUR comfort layer, and a 7-Series individually pocketed coil system with foam encasement. Medium comfort. GreenGuard Gold certified. 20-year warranty. $1,734.75.
What Is a Split Head Mattress — and Why Medium Is the Right Comfort Level for Most Couples.
A split head mattress divides the head section of the mattress vertically down the centre — the top portion is two independent halves, while the foot section remains a continuous unified surface. With a compatible split-head adjustable base, each partner controls their own head and upper body elevation independently. The foot of the bed remains shared, maintaining the feel of a single shared mattress rather than two separate twin beds pushed together.
Medium comfort is the most appropriate base comfort level for a split head mattress used by couples, for the same reason it is the most broadly chosen comfort level in the hospitality industry: it performs correctly across the widest range of sleep positions and body types. Most couples include at least one back or combination sleeper — for whom medium is optimal — and the other partner, whether a back sleeper, side sleeper, or combination sleeper, finds medium an acceptable to ideal fit. Where partners have strongly divergent comfort preferences, the Plush split head variant addresses deeper pressure relief needs; the Medium serves the majority case where both partners fall somewhere in the balanced comfort range.
⚠️ Adjustable base required for independent elevation: The split head design requires a compatible split-head adjustable base to utilise independent head elevation per partner. On a standard flat frame the mattress functions as a standard California King or Eastern King medium hybrid — both sides lie flat and the split seam is present but inactive. The mattress is sold separately from any adjustable base.
Six-Layer Cooling Hybrid Construction. Every Component Explained.
LAYER 1 — COVER
CoolStream Fabric
CoolStream is an engineered cooling fabric that actively conducts body heat away from the sleep surface. On a medium comfort mattress where back and combination sleepers maintain extended contact with the surface, effective cover cooling is a consistent overnight benefit. CoolStream manages surface temperature at the first point of body contact, reducing the gradual heat build-up that disrupts sleep quality particularly during the second half of the night when body temperature regulation is most active.
LAYER 2 — COMFORT
High Density Titanium Memory Foam
In the medium comfort configuration, the titanium memory foam provides balanced body contouring — enough compression to relieve pressure at the lumbar curve and hip without the deep sinkage of a plush surface. Titanium infusion improves the foam's thermal conductivity, drawing heat away from the body as the foam contours to it. High density formulation ensures the medium comfort feel is maintained over the 20-year warranty period rather than softening toward plush prematurely. For back sleepers, the medium memory foam layer cradles the lumbar naturally without allowing the hips to sink past the coil support threshold.
LAYER 3 — COOLING
Ice Flex Cooling Bands
Ice Flex Cooling Bands run through the comfort layer, providing secondary temperature regulation that operates within the foam stack itself rather than only at the surface. The bands flex with the compression cycles of the medium comfort layer and dissipate heat that builds up within the foam during extended sleep contact. For a couple sharing a California King or Eastern King, both sides of the split head mattress benefit from the full-width Ice Flex band system — the dual cooling approach manages temperature independently on each partner's side throughout the night.
LAYER 4 — TRANSITION
CertiPUR Comfort Layer
CertiPUR-US certified foam bridges the memory foam comfort above and the coil support core below, providing graduated firmness that creates a smooth transition between the medium surface feel and the structured coil resistance. CertiPUR-US certification confirms the foam was made without ozone depleters, PBDE flame retardants, mercury, lead, formaldehyde, or phthalates — independent third-party testing that covers the specific foam components used in construction, complementing the GreenGuard Gold certification of the assembled mattress.
LAYER 5 — SUPPORT
7-Series Individually Pocketed Coil System + Foam Encasement
The 7-Series individually pocketed coil system provides independent coil response across the full mattress width — each coil compresses without transmitting force laterally. On a split head shared mattress this independent coil response is essential: one partner's movement, position change, or adjustable base adjustment does not transfer through the coil system to the other side. Foam encasement reinforces the full perimeter on all four sides, creating edge-to-edge stability on a California King or Eastern King surface where the usable perimeter width matters for both partners' sleep quality.
CERTIFICATION
GreenGuard Gold Certified
GreenGuard Gold is UL's most rigorous indoor air quality certification — independent testing for over 10,000 volatile organic compounds with the strictest emission limits for products used in sleeping environments. For a mattress at $1,734.75 — a significant long-term bedroom investment — GreenGuard Gold provides meaningful independent assurance that no harmful chemical emissions enter the bedroom air from the mattress during sleep. Combined with CertiPUR-US foam certification, the Summit Hybrid Medium carries two independent clean-materials certifications.
Medium Comfort + Split Head — The Optimal Combination for Most Couples.
| Couple Type | Medium Comfort Fit | Split Head Benefit |
|---|---|---|
| Both back sleepers ✅ | Optimal for both — lumbar support, balanced resistance | One can elevate head for reading/reflux; other stays flat |
| One back, one combination ✅ | Works for both — medium suits back and combination equally | Independent elevation for TV watching without disturbing partner |
| Both combination sleepers ✅ | Medium is the standard recommendation for combination sleepers | Different schedule partners: one reads/watches elevated, other sleeps flat |
| One back, one side sleeper | Medium works for both — acceptable side sleep, optimal back support | Side sleeper needing elevation for snoring; back sleeper flat |
| Primary side + deep pressure relief needed | Consider Plush for deeper shoulder/hip relief | Both split head variants available — Plush or Medium |
Who Is This Mattress For? 4 Scenarios.
Scenario 1: You or your partner needs head elevation for acid reflux, snoring, or sleep apnea — and the other partner wants to sleep flat on a medium comfort surface undisturbed.
Acid reflux, snoring, and mild sleep apnea are among the most common reasons couples invest in split head adjustable setups — elevating the head reduces gastric acid reflux, opens the airway to reduce snoring, and improves breathing during sleep. On a standard King mattress, the partner who doesn't need elevation is forced to either sleep on an incline or use a separate flat mattress. The Split Head Summit Hybrid Medium allows the partner who needs elevation to achieve it independently while the other sleeps flat on the same mattress in medium comfort — no compromise on either side.
Scenario 2: You share a California King or Eastern King bed and both want the motion isolation of individually pocketed coils across the full King width — plus independent head elevation without the limitation of two separate twin XL mattresses.
The alternative to a split head King mattress for independent elevation is two Twin XL mattresses side by side on a dual adjustable base — which creates a centre seam running the full length of the bed, a noticeable gap between two separate mattresses, and the feeling of two separate beds rather than one shared one. The Split Head Summit Hybrid Medium provides independent head elevation with a unified foot section and a single shared mattress feel — the gap only exists at the head section, not the full mattress length.
Scenario 3: You want a premium cooling hybrid at medium comfort — titanium memory foam and Ice Flex bands — that stays cool for both partners on a shared California King or Eastern King throughout the full night.
Two people sharing a California King generate approximately twice the body heat of a single sleeper — and standard memory foam's heat retention creates discomfort for at least one partner during the night. The Summit Hybrid Medium's dual cooling architecture — CoolStream cover at the surface and Ice Flex Cooling Bands within the comfort layer — manages temperature on both sides of the mattress independently and continuously. The titanium memory foam adds a third thermal management layer within the foam itself. For couples where one or both partners sleep warm, this three-tier cooling system addresses the problem at every level of the mattress stack.
Scenario 4: You want a GreenGuard Gold and CertiPUR dual-certified medium mattress — the highest independent air quality standard for a bedroom investment at the King size level.
At $1,734.75 for a California King or Eastern King split head hybrid, this is a long-term sleep investment — the kind of purchase that warrants the highest available independent certification of bedroom air quality. GreenGuard Gold covers the assembled mattress; CertiPUR-US covers the foam components within it. Together they provide independent verification that no harmful chemicals are being emitted from any part of the mattress into the bedroom environment — covering both the macro product and its constituent foam materials.
Product Specs at a Glance
| Model | Split Head Summit Hybrid — Medium |
| Comfort Level | Medium |
| Profile / Height | 15" |
| Head Section | Split — two independent halves for individual head elevation |
| Cover | CoolStream fabric — active heat dissipation at surface |
| Comfort Layer | High density titanium memory foam — balanced contouring, reduced heat retention |
| Cooling System | Ice Flex Cooling Bands — temperature regulation within the comfort layer |
| Transition Layer | CertiPUR-US certified comfort foam |
| Support Core | 7-Series individually pocketed coil system — independent response, minimal motion transfer |
| Edge Support | Foam encasement — full-perimeter stability, edge-to-edge usable surface |
| Certifications | ✅ GreenGuard Gold · ✅ CertiPUR-US foam |
| Warranty | ✅ 20 years |
| Available Sizes | California King · Eastern King only |
| Packaging | Bed-in-Box — compressed for delivery, expands to full 15" profile |
| Price | $1,734.75 (California King and Eastern King) |
Setup notes: The Split Head Summit Hybrid Medium ships as a Bed-in-Box. Place on a compatible split-head adjustable base or flat platform frame. Allow 24–48 hours for the memory foam and coil system to fully expand to the 15" profile before assessing the medium comfort feel. Deep-pocket split-head fitted sheets rated for 16"+ depth are required — standard fitted sheets will not accommodate the split head seam when the adjustable base raises one side. Confirm adjustable base compatibility for California King or Eastern King before purchasing.
Complete Your Sleep Setup.
- Mattress Pads & Protectors — a waterproof protector preserves the CoolStream cover and comfort layers; for a split head mattress check compatibility with the split head seam before purchasing; browse the full range in Mattress Pads & Protectors
- Sheets & Pillowcases — deep-pocket split-head fitted sheets rated for 16"+ depth required; confirm California King or Eastern King sizing and split-head compatibility before purchasing; browse available options in the Sheets & Pillowcases collection
- Split Head Summit Hybrid Plush — if one or both partners is a primary side sleeper needing deeper shoulder and hip pressure relief, the Split Head Summit Hybrid Plush uses identical construction with plush comfort calibration at the same price
- View all Mattresses & Toppers →
Frequently Asked Questions
Why choose medium over plush for a split head mattress?
Medium comfort is the better choice when both partners sleep primarily on their back or change positions frequently during the night, or when the couple's primary reason for the split head is head elevation (for reading, snoring, or reflux) rather than deep side-sleep pressure relief. Plush is the better choice when one or both partners is a dedicated side sleeper who needs deep shoulder and hip cushioning. If you're uncertain, medium is the more forgiving comfort level for couples because it works acceptably for the widest range of sleep positions — plush is more specifically suited to side sleepers and can feel too soft for back or stomach sleepers.
Does the split at the head create a noticeable gap or ridge during sleep?
When lying flat the two halves of the split head section lie in the same plane — there is no gap or ridge perceptible during normal sleep in a flat position. The seam is present but does not protrude or create a pressure point during flat sleep. When the adjustable base raises one side, the elevated half rises while the other remains flat — the seam at the point of divergence becomes noticeable but is at the shoulder/upper body area rather than directly under the sleeping surface for either partner.
How does this differ from the Split Head Summit Hybrid Plush?
Both the Split Head Summit Hybrid Plush and this Medium use identical construction: 15" profile, CoolStream fabric, high density titanium memory foam, Ice Flex Cooling Bands, CertiPUR comfort layer, 7-Series pocketed coils, foam encasement, GreenGuard Gold, and 20-year warranty at the same $1,734.75 price. The only difference is the comfort calibration — Medium for balanced back and combination sleep support, Plush for deeper side-sleep pressure relief. Both are California King and Eastern King only.
What is the difference between this and the standard Summit Hybrid Medium?
The standard Summit Hybrid Medium is available in Twin through Eastern King as a single unified mattress without any head section split. It is the correct choice for single sleepers, couples who don't need independent head elevation, or any size smaller than California King. The Split Head Summit Hybrid Medium is exclusively for couples on a California King or Eastern King who want or need independent per-partner head elevation via a compatible split-head adjustable base.
What sheets do I need for a split head California King or Eastern King mattress?
You need split-head deep-pocket fitted sheets specifically designed for the split head configuration — the fitted sheet must have two separate elastic sections at the head end that each wrap independently around each half of the split. Standard fitted sheets, even deep-pocket ones, will be pulled off one or both sides of the split head when the adjustable base raises either half. Confirm California King or Eastern King sizing and 16"+ pocket depth when purchasing. Browse the Sheets & Pillowcases collection for available options and confirm split-head compatibility before ordering.
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