Chicco MyFit Zip vs Joie Bay Latch SI 3-in-1 Harness Booster

The MyFit Zip is 1.5 in narrower. The Bay Latch SI 3-in-1 Harness Booster lists for $10 less.

Only the differences are shown.

Chicco MyFit ZipJoie Bay Latch SI 3-in-1 Harness Booster
TypeHarness-to-boosterHarness-to-booster
List price$249.99$239.99Lowest price
Forward-facing weight25–65 lb30–65 lb
Forward-facing heightUp to 54 in27–49 in
Booster weight40–100 lb40–120 lb
Booster height38–57 in43–60 in
Seat weight25 lb23.7 lbLightest
Width17.5 inNarrowest19 in
Head ruleHarness mode only when 'Harness Straps can be positioned at or above the child's shoulders' (manual Select Harness Mode page); no top-of-head rule found in manualForward-Facing: The harness straps MUST be AT or JUST ABOVE the child's shoulders. For forward-facing harnessed mode, DO NOT use the headrest higher than indicated on the label on the child restraint (headrest position 11 as indicated under the backrest softgoods).
InstallationLATCH, seat beltrigid LATCH, vehicle seat belt
Load legNoNo
Anti-rebound barNoNo
RotatesNoNo
Harness heights9Not listed
Recline positions4Not listed
Aircraft labelCertified for aircraft, per the makerCertified for aircraft, per the maker
Expires after8 years10 years

Chicco MyFit Zip

A forward-facing harness seat that converts to a high-back booster, with a zip-off cover. Chicco lists a harness range up to 65 lb and a booster range of 40 to 100 lb.

  • Harness mode goes to 65 lb
  • Chicco says it is certified for aircraft use
  • Four recline positions and nine headrest positions
  • Price listed inconsistently on Chicco's page

Joie Bay Latch SI 3-in-1 Harness Booster

A forward-facing harness seat with rigid LATCH that converts to high-back and then backless booster, covering children up to 60 in.

  • Rigid LATCH
  • Harness to 65 lb, backless booster to 120 lb
  • Ten-year life
  • No rear-facing mode
Ask the meadow

MyFit Zip or Bay Latch SI 3-in-1 Harness Booster?

Answers come from each maker's published specs. Safety and health questions link to the agency or medical source.

Which one will my child use longer, the MyFit Zip or the Bay Latch SI 3-in-1 Harness Booster?

The Joie Bay Latch SI 3-in-1 Harness Booster: it goes forward-facing with a harness, then booster, up to 120 lb. The MyFit Zip goes forward-facing with a harness, then booster, up to 100 lb. The Bay Latch SI 3-in-1 Harness Booster expires after 10 years.

Which is easier to travel with?

MyFit Zip: certified for planes, 25 lb. Bay Latch SI 3-in-1 Harness Booster: certified for planes, 23.7 lb.

What does the extra $10 for the MyFit Zip get you?

No extra listed feature from the ones we track (load leg, anti-rebound bar, rotation, flame retardants). Compare fabrics, ease of install, and fit in your car. Both meet the same federal crash standard.

Still wondering? Write to us at hello@cribpicks.com and we'll look it up.