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The Joie Bay Latch SI Plus is a 3-in-1 seat that runs from a 5-point harness booster through highback booster to a backless booster, covering roughly 30 to 120 lb. Its standout is the 9-position built-in rigid LATCH, which clicks into the vehicle anchors and usually installs faster and more firmly than a seat you buckle in with a belt. Comfort features are unusually deep for the class: a 15-position no-rethread headrest, a removable 7-position footrest, adjustable seat depth and a ventilated back. It suits growing older kids and parents who move the seat between cars, though it is heavy in highback form and the footrest is a love-it-or-leave-it extra.
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Lowest price we've seen: $269.99 on Nov 11 at Babylist. Tracked across 5 stores since Nov 11.
Owners rate it very highly, with 17 ratings averaging 4.9 out of 5. Praise centers on the easy rigid LATCH install and the comfort features for older kids.
The Joie Bay Latch SI Plus is a 3-in-1 car seat that converts between a harness booster, a highback booster and a backless booster as a child grows. It has a 5-point harness that restrains a child across the sturdiest parts of the body. Side impact protection bolsters are for use up to 40 lb., and Guard Surround Safety offers side impact protection in a crash. The seat was tested to FMVSS 213a and 213b, and it is FAA-compliant in harness mode.
Installation uses a 9-position built-in rigid LATCH with color-coded installation indicators. The seat installs with LATCH, with the vehicle seat belt and top tether, or with LATCH and the vehicle belt. The GrowTogether headrest and harness adjust without rethreading, and the AutoClick magnetic chest clip fastens the harness. The headrest has 15 positions, the seat depth has 4 positions, and the removable footrest has 7 positions.
The seat has padded armrests, padded harness and buckle covers, and a ventilated seat back for airflow. Two removable cup holders are dishwasher-safe on the top rack only. The seat has harness storage for booster mode, and its fabrics are removable and machine-washable.
