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MassaMAX MT398

MassaMAX · 4D · SL Track

MassaMAX MT398

The MT398 reaches higher than the MT339, with a stated range of 5'0" to 6'6" and a 4D mechanism on a 55" SL track. The catch is the weight rating: MassaMAX states 350 lb in the product information and 380 lb in the comparison table. Settle which figure applies with the seller before you rely on it.

Height range5'0"–6'6"
Weight limitTwo published values
Rollers / track4D · SL-track
Reclined lengthNot published
Narrowest doorNot published
Shipping weight251 lb
Price band $1,000–$2,000
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 tallest user is 6'6" or shorter and your shortest is 5'0" or taller; this range is exact.
  • You want 4D rollers on a 55" SL track with heat and airbags.
  • A three-year manufacturer warranty matters to you.

Look elsewhere if

  • You need one clear weight limit; the stated 350 lb and 380 lb disagree.
  • Your tallest user is over 6'6"; the rating stops there.
  • You need the carton size before you plan the route.

Everything MassaMAX publishes

Body fit

Recommended user height
5.0ft - 6.5ft
Maximum user weight
Conflicting values on the listing — not confirmed; ask the seller which value applies to this configuration
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
94.4 kg

Delivery & setup

Package dimensions
Ask the seller for the shipping-box size.
Package weight
251 lbs
Delivery
Not published
Assembly
Not published

Warranty, returns & power

Warranty
3 years manufacturer warranty
Return policy
Not published
Voltage
110V-120V~ 60Hz
Wattage
120W
Amperage
1.1A
Power requirements
Not published

Three things to check first

!
Settle the weight rating

MassaMAX states 350 lb and 380 lb in two places. Ask the seller which figure applies to this model before you order.

!
Confirm the height fit

The stated range reaches 6'6". Ask the seller how the shoulder and footrest fit your tallest user.

!
Get the carton size

Ask the seller for the packed carton dimensions before you measure the route.

If the MT398 isn't quite right

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

4D · 29" door
Titan Rejuv 4D
Titan

Titan Rejuv 4D

5'0"–6'5"Up to 260 lb4D massage mechanism
  • You want 4D rollers plus a published door width.
  • A 4D mechanism with a 29" minimum door width and a box size.
  • A 260 lb weight limit, below several chairs we track.
Price band $2,000–$3,000
Check price on Amazon See full specs
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

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, Package dimensions, Amazon "product dimensions" label, Chair weight, Package weight, Recommended user height, Track type, Roller mechanism, Zero gravity (as stated), Heat, Airbags, Warranty, Voltage, Wattage, Amperage: Amazon listing (the seller's own product page; structured extraction).
  • Maximum user weight: Amazon listing text (read directly from the page during review).
  • 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.
  • MassaMAX does not publish a upright dimensions for this chair.
  • MassaMAX does not publish a reclined dimensions for this chair.
  • MassaMAX does not publish a minimum door width for this chair.
  • MassaMAX does not publish a assembly for this chair.
  • MassaMAX does not publish a delivery 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.

Related guides

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Massage chairs for tall people9 chairs on this page