Harmony Defender 360 MAX SIP Harnessed Booster Seat

Our score 9.04 / 10

Research by Peter Crona Last updated Method How we research

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12-54.4 kg/26.5-120 lb forward-facing harness-to-booster seat.

Harmony Defender 360 MAX SIP Harnessed Booster Seat

Pros

  • Combination design covers harness, high-back booster, and backless booster stages
  • Forward-facing focus suits families planning after rear-facing rather than from birth

Cons

  • Not a rear-facing or infant option
  • Long stage range still requires careful harness, shoulder, and vehicle fit checks
Seat Use
Toddler, Booster
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Harmony Defender 360 MAX SIP is a forward-facing combination seat for families who want one post-rear-facing seat to cover harness use and later booster stages. It is most relevant when the child is ready to face forward but still needs a harness before high-back and backless booster use. Do not compare it with infant or convertible rear-facing seats. Before buying, verify the child fits the harness range, the top tether can be used, the seat works with your vehicle belt geometry, and the later booster modes buckle easily.