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Osaki AI Solo Flex 4D

Osaki · 4D · SL-Track

Osaki AI Solo Flex 4D

The Solo Flex 4D adds a body-sensing feature to a 4D SL-track chair with heat and airbags. The weight limit is 280 lb. Ask the seller to confirm your tallest user's fit before you order.

Height rangeNot published
Weight limit280 lb
Rollers / track4D · SL-track
Reclined lengthNot published
Narrowest doorNot published
Shipping weightNot published
Price band $3,000+
Buy on Amazon

Prices change often; Amazon shows today's price. We earn from qualifying purchases.

Who it fits, and who should look elsewhere

A good fit if

  • Your heaviest user stays under 280 lb.
  • 4D rollers on an SL-track with heat and airbags are the draw.
  • The body-sensing feature and zero-gravity recline are what you are comparing.

Look elsewhere if

  • You need a height range; it is Not published.
  • You want a warranty term; it is Not published.
  • You want the entry measured; no carton or door figure is published.

Everything Osaki publishes

Body fit

Recommended user height
Not published
Maximum user weight
280 lbs
Roller mechanism
4D
Track type
SL-Track
Zero gravity (as stated)
Yes
Heat
Yes
Airbags
Yes

Size

Upright dimensions
Not published
Reclined dimensions
Not published
Minimum door width
Not published
Chair weight
Not published

Delivery & setup

Package dimensions
Not published
Package weight
Not published
Delivery
AI Series - Intelligent body sensing: Advanced artificial intelligence technology detects and analyzes your body's specific needs to deliver a customized massage experience.
Assembly
Not published

Warranty, returns & power

Warranty
Not published
Return policy
Not published
Voltage
Not published
Wattage
Not published
Amperage
Not published
Power requirements
Not published

Three things to check first

!
Height fit

No height range is published for the Solo Flex. Send the seller your tallest user's height before you order.

!
Entry route

The carton size is Not published. Ask the seller for the packed carton dimensions and measure every doorway and turn.

!
Warranty

No warranty term is published. Ask the seller what covers the frame, motor and labor, and for how long.

If the Solo Flex isn't quite right

Each of these is another chair we track. The lines compare published values only; this is not a ranking.

3D · 29.5" door
Osaki OS-3D Champ II
Osaki

Osaki OS-3D Champ II

Up to 264 lb3D massage mechanismSL-style Track
  • You want the delivery numbers in writing before you buy.
  • Lists a 29.5" minimum door width, its reclined size and its box size.
  • A 264 lb weight limit and no height range.
Price band $1,000–$2,000
Check price on Amazon See full specs
4D + 3D · 380 lb
Alfine A688
Alfine

Alfine A688

5'0"–6'4"Up to 380 lb4D + 3D
  • Premium 4D with a 380 lb rating
  • 4D + 3D mechanism with a 380 lb rating. 3-year warranty.
  • Top price band, and the box size isn't published.
Price band $3,000+
Check price on Amazon See full specs

The comparisons above are read from each chair's recorded values for the chairs we track. Check the current listing and terms before you buy.

Where these numbers come from

Read our full method
Sources for this chair
  • Model number, Amazon "product dimensions" label, Maximum user weight, Track type, Roller mechanism, Zero gravity (as stated), Heat, Airbags, Delivery: Amazon listing (the seller's own product page; structured extraction).
  • Amazon listing — Value source
  • Last checked Oct 8, 2026.
What we haven't checked
  • We haven't sat in this chair. We make no comfort or medical promise for any body type.
  • Osaki does not publish a package dimensions for this chair.
  • Osaki does not publish a upright dimensions for this chair.
  • Osaki does not publish a reclined dimensions for this chair.
  • Osaki does not publish a minimum door width for this chair.
  • Osaki does not publish a recommended user height for this chair.
  • Osaki does not publish a voltage for this chair.
  • Each model's specs carry a check date. After that date the page stops presenting the model as currently buyable and asks you to confirm availability on Amazon.

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