Carrot 3 Booster Seat

A booster seat with an internal harness made by Convaid (a brand of Etac).  In U.S., headquartered on the West Coast in Torrence, CA, and on the East Coast in Charlotte, N.C.


This booster seat has a harness that provides positioning & stability for children needing extra support of the head, trunk, and/or pelvis.  Adjusts to fit a child as they grow into teenage years and even adulthood. The child MUST also wear a vehicle’s lap-shoulder belt.  Installation using LATCH is recommended.

Last updated on February 13, 2024.

Child Requirements

  Pounds Kilograms Inches Centimeters Age (years)
Minimum 79 35.83 55 139.7 none
Maximum 165 74.84 70 177.8 none

Measurements and Characteristics

Car Seat Mass (Weight)

21 lbs./9.52 kg (base model)

Vehicle Fit Characteristics

  Outside height: 28 to 33 in./71.1 to 83.8 cm
  Widest outside width: 22 in./55.88 cm 
  Vehicle requirements:
  • Vehicle seating position must be equipped with a lap-shoulder belt.
  • A seat with a LATCH system is recommended.  (If LATCH is not present, the use of Etac’s accessory top and lower securement strap is recommended.)

Child Fit Characteristics

  Narrowest torso width: 15.25 in./38.1 cm
  Narrowest seat cushion width: 16.5 in./41.9 cm
  Seat cushion depth: 15-16.5 in./38-41.9 cm
  Seat cushion depth extender options: n/a

Harness Fit Characteristics

  Harness Type:
  • Four-point; positional only
  • Can be made into a five-point positional harness by adding accessory crotch belt.
  Number of harness height positions: One;  no-rethread harness
  CR bight to lowest shoulder height position: 10 in./25.4cm
  CR bight to highest shoulder height position: 21.5 in./55 cm (when backrest extenders added)
  Crotch strap present: Yes (optional add-on, sold separately)
  Crotch strap adjustability: Yes, 6 in./15.24 cm and 10 in./25.40 cm lengths available
  CR bight to nearest crotch strap position: No information provided; contact Etac
  CR bight to farthest crotch strap position: No information provided; contact Etac


  Semi-recline allowed in forward-facing position: Yes.  Back of CR rotates 180° to a flat position but must not be greater than 30° from vertical when vehicle is in motion.
  Other: Recline wedge available to increase hip flexion by 20°.


  Tether present: Yes; use optional but recommended.  (LA attachment is also a standard part that is a recommended option.)
  Special tethering:
  • If no tether anchor is present, use of Etac’s top/lower securement straps is recommended (sold separately).
  • Weight limits for use of LATCH do not apply to booster seats.

Accessories / Add-ons

Standard Accessories:

  • Head pillow
  • Body and seat balance pads
  • Shoulder protector wings  (each adjustable by 2″ for a total of 4″ extendability for growth)
  • Backrest extension padding (2 in./5 cm) to fill gap created by raising backrest
  • Four-point harness

Add-ons available:

  • Top and lower securement straps (Recommended for use in vehicles without LATCH anchors.)
  • Backrest extensions (4 in./10 cm) to fill gaps created when raising backrest to 32.8 ins/ 83.3 cm
  • 3D Body Balance Pads
  • Booster Support Tray (crash tested)
  • Large crotch belt
  • Seat-angle adjustment wedge (front height 4.25 ins./10.8 cm, angle 20°)

Miscellaneous Information

  • MSRP (U.S. dollars): Starts at $3,035.00 (no accessories)
  • Company certifies to meet standard:
    • FMVSS213 (U.S.): Yes
    • CMVSS 213 (Canadian): No
  • Will ship to Canada? Yes
  • Owner’s manual languages available: English

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