Harmony Defender 360 MAX 3-in-1 Harness Booster Seat
- 5-point harness up to 65 lb, then high back and backless booster
- 120 lb maximum weight
- UAS/LATCH plus top tether
- 9-position no-rethread harness height
- 3 across in most vehicles
- 10 years use life, FMVSS 213 and CMVSS 213.2
Updated 5 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A forward facing harness to booster seat with full body EPE foam, LATCH and tether, and a slim shape for three across. It never faces rearward, so it is only for children past that stage.
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ASIN: B0FL2WGLPLModel: Defender 360 MAXCategory: Booster Car Seats
Overview
Back seats shared by three kids are where the Harmony Defender earns its keep. It starts as a forward facing harnessed seat, converts to a high back booster and then a backless booster, with energy absorbing foam around the head, back and base.
Harmony gives one seat a long run from harnessed toddler to big kid booster, with LATCH installation and a slim V shaped base. It is forward facing only, so infants and young toddlers need a different seat.
Who it's for
Preschoolers ready to face forward, who will later need a booster, get years from this one seat. Parents of infants should start with a rear facing convertible.
Pros and cons
- Three modes from harness to backless
- LATCH and top tether
- No-rethread harness adjuster
- Full EPE foam protection
- Forward facing only
- Minimum size not in bullets
- Bulky in backless mode storage
Performance notes
Energy absorbing foam around the head and torso spreads crash forces, while LATCH and the tether limit seat movement. In booster modes, the marked belt guide decides how well the adult belt fits.
Specifications
| Brand | Harmony |
|---|---|
| Model | Defender 360 MAX |
| Dimensions & fit | |
| Maximum Weight Recommendation | 120 pounds |
| Number of Height Positions | 9 |
| Item Dimensions D x W x H | 20 in D x 18.3 in W x 26.5 in H |
| Orientation | Forward facing |
| Harness weight limit | Up to 29.5 kg / 65 lbs |
| Construction & materials | |
| Material Type | High density polyethylene, EPE foam |
| Color | Black |
| Compatibility & installation | |
| Installation Type | UAS/LATCH, top tether |
| Other details | |
| Harness Type | 5-point |
| Safety standards | FMVSS 213, CMVSS 213.2 |
| Use life | Up to 10 years from manufacture |
Frequently asked questions
Can the Harmony Defender be used rear facing?
No. It is a forward facing seat that goes from a 5-point harness to a high back booster and then a backless booster.
How long can the Harmony Defender harness be used?
The 5-point harness is listed up to 29.5 kg, or 65 lbs, before switching to booster mode.
How does the Harmony Defender install?
With the Universal Anchorage System (UAS/LATCH) and a top tether.
When does the Harmony Defender expire?
It is listed as safe for use up to 10 years after the date of manufacture.