coming soon

icon of a circle with a car seat inside
rigid LATCH
icon of a shoe
7-position footrest
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3-in-1

Available exclusively at some one

Buy now
product details

INSTALLATION

  • 9-position built-in rigid LATCH
  • Color-coded installation indicators
  • Installs with LATCH, vehicle seat belt & top tether, or LATCH & vehicle belt
  • FAA-compliant in harness mode

SAFETY

  • Tested to the newest safety standards, FMVSS 213a and 213b
  • 5-point harness restrains children across their sturdiest body parts
  • Side impact protection (SIP) bolsters for use up to 40 lb. 
  • Guard Surround Safety™ offers side impact protection in the event of a crash

COMFORT

  • Removable 7-position footrest keeps growing legs comfortable
  • 4-position adjustable seat depth provides more room as your child grows
  • 15-position headrest
  • Padded armrests, harness and buckle covers
  • Ventilated seat back encourages airflow

CONVENIENCE

  • 3 car seat modes in one
  • GrowTogether™ no-rethread headrest & harness
  • AutoClick™ magnetic chest clip
  • 2 removable, dishwasher-safe cup holders (top rack only)
  • Harness storage for booster mode
  • Removable, machine-washable fabrics
specifications

Product Dimensions:

harness booster & highback size: l 16 x w 19 x h 24 in.
backless booster size: l 16 x w 19 x h 9 in.

Approx weight: 

harness booster & highback: 23.7 lb. 
backless booster: 5.2 lb.

Usage: 30 lb. up to 120 lb. | 27 up to 60 inches

harness booster: 30 lb. up to 65 lb. | 27 up to 49 inches
highback booster: 40 lb. up to 100 lb. | up to 57 inches, minimum 4 years old
backless booster: 50 lb. up to 120 lb. | 43 up to 60 inches, minimum 4 years old

Testing certification: FMVSS 213a & 213b


Joie bay™ latch SI plus law tag

what's in the box

bay latch SI

bay footrest

lower anchor guides

instruction manual

how to & support
GET A LEG UP

7-position footrest included

Need another reason to get your kid excited about a car seat? The removable footrest has 7 positions that adjust to keep your child’s growing legs comfortably stabilized so they don’t dangle over the edge of the seat. Not only is it comfortable for your kiddo to rest their legs, but it also helps promote an upright posture.

Woman installing a charcoal grey joie bay™ latch SI plus car seat featuring side-impact wings in a family vehicle.
EASY AS 1, 2, 3!

rigid LATCH

Getting the bay™ latch SI installed is simple, thanks to the built-in rigid LATCH connectors and easy-to-read colored indicators that click right onto your car’s anchor points. Just extend the lower anchors, snap them in, push the seat back, and attach the tether. It’s so simple, you’ll feel like a pro from the start. 

CUSTOMIZED SEATING

from toddler to pre-teen

Your stubborn toddler to ‘too-cool’ pre-teen won’t argue with you about getting in this seat. From the 4-position adjustable seat depth that gives them more room as they grow, to the plush harness and armrests, every detail is designed to keep your child comfy as they grow. The ventilated seatback helps them stay cool, while the 15-position headrest makes it easy to get the perfect fit for every ride.

Three children sitting in their own charcoal Joie bay™ latch SI plus car seat at different stages of growth and size.
MY HOW THEY'VE GROWN

3-in-1 car seat

This combination car seat features three modes that adapt along with your child, keeping them seated safely and comfortably as they grow. Bay latch SI starts as a forward-facing harnessed car seat, then transitions to a highback booster and finally a backless booster – three seats in one!

Parent adjusting the five-point harness on a charcoal grey Joie bay™ latch SI plus car seat with an integrated cup holder.
SAFETY COMES FIRST

tested to the newest safety standards

You can ride confidently knowing bay™ latch SI plus is tested to the newest safety standards. FMVSS 213a and 213b refer to the most recent testing standards required to sell car seats in the US and includes vital updates to testing requirements such as standardized side impact testing. Learn more about FMVSS and the new standards here.

no such thing
as too safe

Your baby gear should work hard for you every single day. That’s why we push our products to the extreme during testing: We want to make sure they’re up for any challenge you may face.

super strength
materials

We use only high-quality materials in creating your gear: like aero-grade aluminum, super-strength steel and undiluted plastics.