Browse all models →VERIFIED PRODUCT REVIEW
Model: MD321 (manual table also lists A306; verify product label)
A full-size Amazon model with a 53.15-inch SL-track, automatic footrest extension and a documented 300-pound capacity.
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QUICK SPECIFICATIONS
Source checked: Amazon-linked MassaMAX MD321 manual. Specifications may change by revision or seller bundle; match the model name and product label before purchasing.
DETAILED OVERVIEW
The MassaMAX MD321 combines a 3D mechanism with a 53.15-inch SL-track, automatic body scan, 12 automatic programs, full-body air compression, foot rollers, back and calf heat, yoga stretching, and zero-gravity recline.
Its clearest buying specifications are a 300-pound maximum, 7.9-inch automatic footrest extension, 1.98-inch rear gap, and three-year warranty for quality defects. The main uncertainty is fit: the source does not publish a recommended user-height range or complete reclined dimensions.
WHO IT SUITS
FEATURE ANALYSIS
The 3D mechanism adds adjustable in/out pressure while the long SL-track continues beneath the seat. Automatic scanning helps place the massage, but the absence of a height range still matters.
The leg rest extends automatically by 7.9 inches. Sole rollers, calf compression, and back/calf heat create distinct lower-body features rather than one generic “full-body” function.
FIT AND ROOM PLANNING
The published 300-pound maximum is useful, but no height range is stated. The 7.9-inch footrest extension suggests flexibility for longer legs, not proof that a specific tall user will fit the shoulder scan and seat.
The chair is 61.02 × 29.53 × 45.08 inches upright and needs 1.98 inches behind it. Full reclined dimensions and carton measurements are not published in the extracted manual.
Check the room-fit calculator →ADVANTAGES
LIMITATIONS
DELIVERY AND SETUP
205 lb chair; confirm carton size and service level with seller. The chair weight is 205 lb, and the setup guidance is: Assembly required; two people recommended. Measure every doorway, turn, stair, and landing; confirm whether delivery is curbside, threshold, room-of-choice, or white glove.
WARRANTY AND SUPPORT
The Amazon-linked manual states a 3-year warranty for quality defects. It does not break out labor, parts, structure, or in-home service in the extracted text.
The manual lists MassaMAX customer service at 866-909-6062 and directs Amazon purchasers to seller support.
NOT RELIABLY VERIFIED
SIMILAR CHAIRS TO CONSIDER
A 3D alternative with a published 4′9″–6′2″ range and 330-pound maximum.
Compare verified details →HealthRelifeA 4D alternative with a 4′9″–6′2″ stated range and 300-pound current specification.
Compare verified details →KyotaA premium 4D option with a verified 5′4″–6′7″ optimal range.
Compare verified details →PRODUCT-SPECIFIC FAQ
Not published; automatic footrest extends 7.9 in
300 lb
1.98 in rear
Yes. Zero-gravity recline is documented, but the number of distinct positions is not stated in the source used here.
Foot rollers and 7.9-inch auto-extending footrest
Back and calf heat
Assembly required; two people recommended
53.15-inch SL-track. Yes. Automatic body scan is documented.
LEARN BEFORE YOU BUY