Osaki Platinum Solis Duo 4D+ Massage Chair

Flex Track System — Beyond the Limits of a Standard SL-Track

A standard SL-Track locks the base and backrest at a fixed angle relative to each other. The Solis’ Flex Track breaks that constraint — letting the chair recline further than any conventional track design allows.

Traditional SL-Tracks are rigid — the angle between the seat base and the backrest cannot change during recline, which limits how far the chair can lay back. The Solis’ Flex Track incorporates a flexible joint that allows the backrest and base to move independently of each other, enabling the full 190° recline that makes the Solis’ stretch program unlike anything a standard track produces. The 4D mechanism maintains precise roller contact along your spine throughout the entire recline range.

190° Stretch Flexibility — A Full-Body Stretch That Most Chairs Cannot Reach

At 190°, the Solis goes past fully flat — opening the chest, decompressing the spine, and delivering a stretch that approaches the kind of supported back-bend a physical therapist would apply manually.

Most massage chairs stop at 170°–175°. The Solis reclines a full 190°, a position that goes beyond horizontal and allows the body to open in ways that normal zero gravity recline cannot achieve. For anyone who carries chronic compression from long periods of sitting, standing, or training, this level of stretch reaches the deepest layers of spinal and postural tension rather than simply loosening the surface muscles.

4D Massage Mechanism — Variable Depth and Rhythm Across the Entire Back

The 4D system gives the rollers independent control over how deeply they press into tissue and how fast they move — producing a massage that adapts in real time rather than moving at a fixed pace and depth.

The Solis’ 4D mechanism covers the full back from neck to glutes, delivering a wide range of massage styles and intensities as it travels the Flex Track. The result replicates the varied, responsive quality of a skilled therapist’s technique — lighter through sensitive areas, firmer through the muscles that need it — rather than the uniform pressure of a conventional roller that cannot modulate its own depth.

Intelligent Voice Recognition

Change programs, adjust intensity, and control the chair without sitting up or reaching for the remote — your voice does it.

The Solis responds to spoken commands with fast reactivity, making it the natural way to make adjustments once you are reclined and settled. Voice control works alongside the touchscreen tablet and side panel, so you can use whichever is most natural for you in the moment — switching programs during a session without breaking the state of relaxation you have built.

Extended 13.5-Inch Calf Rest

A longer calf rest means more of your calf muscle is actually in contact with the chair — and more contact means a more effective massage for a wider range of body types.

At 13.5 inches, the Solis’ calf rest is meaningfully longer than what most massage chairs offer in this category. This extra length ensures the calf rollers and airbags make proper contact across the full length of the calf muscle rather than concentrating pressure at a single point — a practical benefit for taller users and for anyone who wants thorough lower-leg coverage rather than a localized squeeze.

Touchscreen Controller

Every program, every adjustment, and every setting displayed clearly on a touch-responsive screen — no hunting through nested menus or pressing buttons you can’t see.

The Solis’ touchscreen controller makes navigation straightforward regardless of whether you are using the chair for the first time or the fiftieth. The interface presents the 18 auto programs and 5 manual modes in a clean layout, with clear indication of what the chair is currently doing and intuitive controls for making adjustments mid-session.

54-Airbag Full-Body Compression

Fifty-four air cells covering shoulders, arms, hips, calves, and feet — one of the largest airbag counts in its class, creating full-body coverage that operates throughout every session.

While the 4D rollers work the back, 54 airbags deliver rhythmic compression to the rest of your body simultaneously. The squeeze-and-release cycle at the shoulders, arms, hips, calves, and feet promotes circulation, reduces peripheral soreness, and keeps the full body engaged rather than leaving the extremities idle while the roller mechanism does its work. The result is a session that addresses the whole body, not just the back.

Zero Gravity Recline and Space-Saving Technology

Your knees rise above your heart, your spine decompresses, and the rollers work more deeply at the same intensity — all in a chair that needs only 10 inches of wall clearance to recline fully.

Zero gravity distributes body weight evenly across the backrest, eliminating spinal loading and allowing the muscles alongside your spine to genuinely relax rather than remaining partially contracted. The Solis’ space-saving mechanism slides the seat forward as it reclines rather than swinging the backrest backward, keeping the back of the chair close to the wall throughout the full range of motion.

Graphene Lumbar Heating Therapy

Graphene conducts heat more evenly and efficiently than conventional heating elements — the warmth spreads uniformly across the lumbar rather than concentrating in a single hot spot.

The Solis’ graphene heating element warms the lower back throughout the session. Heat softens the surrounding muscle tissue, making the roller work more effective at the same pressure setting and providing direct relief for the chronic tightness that accumulates in the lumbar from extended sitting or standing. For anyone who regularly wakes up with lower back stiffness, the combination of heat and roller pressure addresses the area on both a surface and deeper level simultaneously.

18 Auto Massage Programs

Eighteen purpose-built programs cover every session goal from morning activation to deep-sleep preparation — one tap is all it takes to start a session tuned to exactly what you need.

Each auto program orchestrates the rollers, airbags, heat, and recline position together for a complete, coordinated session. Whether you want a targeted neck and shoulder treatment, a full-body air pressure session, an extended stretch, or a program designed to wind you down for sleep, the Solis has a starting point that is already calibrated for that goal.

Full Body Relaxation	Alignment Mode	Chinese Massage	Neck & Shoulder	Japanese Massage
Waist & Hip Massage	Handstand Stretch	Exercise Relaxation	Lay Down to Sleep	Release Pressure Mode
Super Stretch	Full Body Air Pressure	Man Healthcare	Upper Body	Woman Healthcare
Lower Body	Elderly Healthcare	Quick Massage

5 Manual Massage Styles — You Choose the Technique and the Target

When you know exactly what your body needs, manual mode gives you direct control over technique and location — no program, no sequence, just the massage you want where you want it.

Five manual styles cover the full range from soft and rhythmic to firm and point-specific: Knead for rotating muscle relief, Tap for percussive stimulation, Knead & Tap to combine both at once, Shiatsu for precise acupressure-style pressure, and Rolling for a fluid spinal mobilization pass from neck to glutes.

Knead

Tap

Knead & Tap

Shiatsu

Rolling

Automatic Extendable Footrest — Up to 5 Inches of Adjustment

Taller users get proper lower-leg support without manually adjusting anything — the footrest finds its position automatically and can be fine-tuned at any point during the session.

The footrest extends up to 5 inches to ensure the foot rollers and calf airbags make contact with the correct anatomy regardless of your height. When the footrest is properly positioned, the spinning calf rollers and airbag compression do their job correctly. When it is not, both systems miss their targets. The automatic adjustment eliminates that problem from the start.

Spinning Calf Rollers and Reflexology Foot Rollers

The lower leg and foot receive genuine roller work — not just airbag compression — with dedicated spinning calf rollers and reflexology foot rollers designed around acupressure point placement.

One spinning roller per calf works actively through the calf muscle while airbag compression surrounds it from outside, with both systems running simultaneously. Two reflexology rollers per foot trace a path from heel to toe using ridged surfaces designed to stimulate the acupressure points that correspond to major muscle groups and organs throughout the body. The combined lower-leg treatment is thorough enough to draw attention on its own even in a session that also includes a full-back 4D massage.

Removable Headrest

Remove it for a fully open neck and shoulder session, or keep it in place for head support — the headrest adjusts to how you want to use the chair that day.

The detachable headrest lets you customize the upper section of the chair to match your preference and the type of session you are running. Some users prefer direct roller contact at the neck without the headrest in the way; others want the support. Either configuration works, and switching between them takes seconds.

LED Mood Lighting

Ambient lighting built into the chair creates a spa-like environment around the session without requiring you to dim the room or set anything up separately.

The Solis’ LED mood lighting adds a layer of environmental immersion to the massage experience. Combined with the Bluetooth surround speakers, it turns a living room chair into something closer to a dedicated relaxation environment — a feature that owners who use the chair for unwinding after difficult days consistently mention as part of what makes the routine feel intentional rather than incidental.

Side Control Panel

The most-used controls are always within arm’s reach on the armrest — so routine adjustments never require picking up the tablet remote mid-session.

The side control panel puts quick access to core functions right at your fingertips while you remain reclined. It works alongside the touchscreen tablet and voice recognition — use whichever of the three is most convenient for the adjustment you want to make without breaking the rhythm of the session.

HD Bluetooth Surround Speakers

Your music, podcast, or guided meditation plays from high-definition speakers positioned around you during the session — no earbuds, no cords, no neck strain.

Pair your phone via Bluetooth and the audio becomes part of the session rather than a separate activity. The surround placement creates an immersive listening experience that works at lower volumes — better for relaxation than earbuds and far better for unwinding than trying to hear your phone speakers across the room.

Phone Holder and USB Charging Port

Your phone stays within reach and stays charged throughout every session — no hunting for it when the session ends or worrying about battery level when it starts.

The built-in phone holder keeps your device accessible during the session, whether you are using it for the Bluetooth speaker connection, controlling the chair through its app, or simply keeping it in sight. The USB port alongside it keeps the phone charged so you are not trading one problem (unreachable phone) for another (dead battery).

Questions about the Solis 4D+? Our experts have helped thousands of buyers since 2005.

Call 888-612-8862

The Solis 4D+ stands apart from the broader Osaki lineup in one fundamental way: the Flex Track. Every other feature on this chair — the 4D mechanism, the 54 airbags, the graphene lumbar heat, the voice recognition — can be found, in various forms, on other chairs in the market. The ability to recline to 190° is the Solis’ defining capability, and it is not a specification that exists in any conventional massage chair. At 190°, the body opens past horizontal into a supported back-bend position that decompresses the spine in a way that zero gravity alone cannot match. For buyers who have found even full-recline massage chairs leave their deeper spinal tension untouched, this is the feature worth paying attention to.

The 54-airbag count is the highest we carry in its price range and it is felt throughout every session. Compression at the shoulders, arms, hips, calves, and feet runs concurrently with the 4D roller work, meaning the whole body is engaged rather than waiting for the rollers to finish the back before anything else happens. The extended 13.5-inch calf rest is a practical detail that rarely gets discussed but consistently impresses taller users once they sit down — proper contact through the full calf means the spinning rollers and airbag compression work correctly rather than pressing into a single point on a longer leg.

The ambient LED lighting and HD Bluetooth surround speakers are genuine additions to the session experience, not afterthoughts. Owners who build a relaxation routine around this chair consistently describe the combination of sound and lighting as part of what makes the habit stick — the chair creates an environment rather than just a mechanism, and that distinction matters for daily use. The three control modes — touchscreen tablet, side panel, and voice recognition — cover every preference and every posture, so adjusting the session never requires an awkward reach.

The Solis is the right chair for buyers who want the deepest stretch available in a massage chair and a full-body compression session to match it. It is an especially strong fit for anyone dealing with the kind of postural compression that accumulates from years of desk work, heavy training loads, or chronic lower back stiffness. Call us at 888-612-8862 and we will give you an honest answer about whether the Solis matches your priorities.

What We Love

• 190° Flex Track stretch — The only chair in this category that reclines past horizontal. For buyers with deep postural compression, this stretch reaches areas that a standard zero gravity recline simply does not.
• 54 airbags — one of the highest counts in its class — Full-body compression at shoulders, arms, hips, calves, and feet runs throughout the entire session alongside the roller work, not in sequence with it.
• Graphene lumbar heating — Graphene conducts and distributes heat more evenly than standard heating elements, delivering uniform warmth across the lumbar rather than a localized hot spot.
• 13.5-inch extended calf rest — More contact area means the calf rollers and airbag compression actually reach the full calf muscle, a practical difference that taller users feel immediately.
• Spinning calf rollers + reflexology foot rollers — Two rollers per foot and one spinning roller per calf provide active lower-leg work, not just airbag pressure from the outside.
• Three control modes — Touchscreen tablet, side panel, and voice recognition cover every preference. No position is awkward and no adjustment requires interrupting the session.
• 18 auto programs + 5 manual styles — The broadest auto program library in its tier, with enough variety that daily use over months stays genuinely non-repetitive.
• LED mood lighting + HD Bluetooth speakers — Together they create a dedicated relaxation environment around the session, not just a mechanical experience. Owners who build a daily chair habit consistently cite this as part of what makes the routine stick.
• Removable headrest — A small detail with a meaningful effect — remove it for an open neck and shoulder session, keep it in when you want head support. Adjustable in seconds.

Worth Knowing

• The 190° stretch is an intense position — Users who have never experienced a chair that reclines past horizontal should approach the Super Stretch program gradually at first. The Solis’ stretch capability is the feature most people are most surprised by — in both how good it feels and how different it is from anything they have tried before.
• Wall clearance is 10 inches — This is more than the Maestro LE (5”) or DuoMax (5.5”), though still well within a normal room placement. If you are placing the chair in a tight corner, this is worth measuring before it arrives.
• Maximum foot size is US Men’s size 13 — Worth confirming before ordering if you are near that limit.

Our Verdict

The Solis 4D+ is the right chair for buyers who want the deepest stretch available in a massage chair — a 190° Flex Track that goes where no standard SL-Track chair can — paired with one of the highest airbag counts in its class and a genuinely immersive session environment. Best for buyers with deep postural compression, stretch-focused recovery goals, or anyone who has found standard zero-gravity chairs leave their most persistent tension untouched. Look elsewhere if your primary goal is simultaneous dual-area back coverage rather than a stretch-forward experience, or if you need a chair that fits within 5 inches of the wall.

Call 888-612-8862

Tell us what you need and we’ll narrow it down in about 2 minutes.

The Stretch-Focused Recovery User

You have tried zero gravity chairs and found the position helpful but insufficient. The Solis’ 190° Flex Track takes spinal decompression and full-body opening to a level that no conventional chair can reach. The Super Stretch and Handstand Stretch auto programs are built specifically around this capability — they use the full recline range and 54-airbag system together for the most complete stretch the chair can produce.

The Desk Worker with Whole-Body Tension

Neck, shoulders, lower back, hips, and legs — all addressed simultaneously. The 54 airbags cover your arms, hips, calves, and feet while the 4D rollers work your spine, and the graphene lumbar heat warms the area that carries the most accumulated desk tension. The LED lighting and Bluetooth speakers make the daily routine feel less like maintenance and more like recovery.

The Relaxation-Forward Buyer

You want a massage chair experience that goes beyond the mechanical — one that creates an environment as much as a sensation. The Solis’ LED mood lighting, HD surround speakers, 18 auto programs, and voice-controlled adjustments combine into a session that feels designed, not just functional. The Lay Down to Sleep program and the Relax and Release Pressure modes are built for exactly this user.

When to Consider a Different Chair

If your primary priority is simultaneous upper and lower back coverage — both zones being massaged at the same time rather than the rollers traveling between them — the Osaki OS-Pro 4D DuoMax uses a dual-mechanism design with two independent roller assemblies that achieves exactly that. The Solis and the DuoMax address similar therapeutic goals through different engineering priorities.

If you need a chair that fits within 5 or 6 inches of the wall, the Osaki OS-4D Pro Maestro LE needs only 5 inches of clearance. Call 888-612-8862 and we will walk through which of these fits your space and your priorities in about two minutes.

Not sure if the Solis is the right fit?

Our experts have helped thousands of buyers since 2005 — tell us what matters to you, and we’ll narrow it down in about 2 minutes. Call 888-612-8862 or chat with us now.

Researching massage chairs takes time.

Our experts have helped thousands of buyers since 2005 — tell us what matters to you, and we’ll narrow it down in about 2 minutes. Call 888-612-8862 or chat with us now.