1. Introduction and Overview
The Chicco MyFit Harness + Booster Car Seat is a versatile 2-in-1 car seat designed for extended use, adapting as your child grows. It transitions seamlessly from a 5-point harness car seat for toddlers to a belt-positioning booster for older children. This manual provides essential information for proper installation, operation, maintenance, and safety to ensure your child's secure and comfortable travel.
2. Safety Information
Your child's safety is paramount. The Chicco MyFit ClearTex Harness + Booster Car Seat is engineered to meet the Federal Motor Vehicle Safety Standard FMVSS 213a – Side Impact, featuring Advanced Side Impact Protection (ASIP).
Key Safety Features:
- Advanced Side Impact Protection (ASIP): Integrated protection around the head and torso.
- Flame Retardant-Free ClearTex Materials: Fabrics are free from added flame retardant chemicals and are GREENGUARD Gold Certified for low chemical emissions, contributing to healthier air quality.
- 5-Point Harness System: Provides secure restraint for toddlers.
- Belt-Positioning Booster: Guides the vehicle's seat belt for proper fit over older children.
Always read and follow all labels and instructions provided with the car seat and your vehicle's owner's manual before installation and use.
3. Product Features
- 2-in-1 Design: Converts from a 5-point harness (25-65 lbs) to a belt-positioning booster (40-100 lbs).
- 9-Position Headrest: Easy-adjust headrest accommodates your growing child.
- 4-Position Recline: ReclineSure leveling system ensures a proper fit in the vehicle and enhances child comfort.
- ErgoBoost Seat: Extra deep, contoured seat with dual-density foam padding for a comfortable ride.
- Space-Saving Design: Slim profile allows for fitting three-across in the backseat without compromising comfort.
- Premium LATCH Connectors: For secure and easy installation in harness mode.
- LockSure Belt-Tightening System: Ensures a tight and secure installation using the vehicle's seat belt.
- RideRight Bubble Levels: Provide clear visual indicators for proper seat angle during installation.
- Dishwasher-Safe CupFolders: Two removable cup holders with push-button release fold away to save space.
- Easy-Access Seat Pad Zipper: Simplifies installation and transitioning between modes, and makes cleaning easier.
4. Setup and Installation
Proper installation is crucial for safety. The Chicco MyFit offers multiple installation options to suit your vehicle and child's needs.
Installation Modes:
- 5-Point Harness Mode: For children weighing 25-65 lbs (11.4-29.5 kg). Use LATCH connectors or the vehicle's lap/shoulder belt with the LockSure system.
- Belt-Positioning Booster Mode: For children weighing 40-100 lbs (18-45.3 kg). Use the vehicle's lap/shoulder belt.
Step-by-Step Installation (General Guidance):
- Choose the Correct Mode: Determine whether to use harness mode or booster mode based on your child's weight and height.
- Adjust Recline: Use the ReclineSure leveling system (levels 1-4) to achieve the correct recline angle for your child and vehicle. The RideRight bubble levels will indicate proper positioning.
- Secure the Car Seat:
- LATCH Installation (Harness Mode): Attach the premium LATCH connectors to your vehicle's lower anchors. Tighten the strap until the car seat is secure and does not move more than 1 inch side-to-side or front-to-back at the belt path.
- Vehicle Belt Installation (Harness or Booster Mode): Route the vehicle's lap/shoulder belt through the designated belt path. Use the LockSure belt-tightening system to secure the seat tightly. For booster mode, ensure the shoulder belt is positioned correctly over your child's shoulder and the lap belt is low on their hips.
- Adjust Headrest and Harness: Ensure the headrest is at the appropriate height and the harness straps are snug against your child's shoulders.
Refer to the detailed instructions and diagrams on the car seat itself and in the full product manual for precise installation steps.

Image: Chicco MyFit Car Seat in Harness Mode.

Image: Chicco MyFit Car Seat in Booster Mode.

Image: Chicco MyFit Car Seat highlighting ErgoBoost seat and 4-position recline.

Image: Space-saving design allowing three car seats across.

Image: ReclineSure Leveling System with indicators.
5. Operating Instructions
Operating the Chicco MyFit involves adjusting it to fit your child and securing them properly for each ride.
Adjusting the Headrest and Harness:
The 9-position headrest and harness system adjust simultaneously. Locate the orange pull tab at the top of the headrest. Squeeze the tab and slide the headrest up or down to position the harness straps at or just above your child's shoulders in harness mode, or to properly align the vehicle's shoulder belt in booster mode.

Image: Adjusting the 9-position headrest.
Securing Your Child:
- Harness Mode: Place your child in the seat. Bring the harness straps over their shoulders and buckle the chest clip at armpit level. Insert the two buckle tongues into the crotch buckle until they click. Pull the harness adjustment strap at the front of the seat to tighten the harness until it is snug.
- Booster Mode: Position your child in the seat. Route the vehicle's lap/shoulder belt through the red belt guides on the car seat. Ensure the lap belt is low on your child's hips and the shoulder belt crosses the center of their shoulder and chest.
Converting from Harness to Booster Mode:
When your child outgrows the harness mode (check weight and height limits), you can convert the MyFit to a belt-positioning booster. This typically involves storing the harness straps within the car seat's compartments. Refer to the full manual for detailed instructions on harness removal and storage.
6. Maintenance and Cleaning
Regular maintenance and cleaning will extend the life of your car seat and keep it hygienic for your child.
Cleaning the Fabric:
The MyFit features an easy-access seat pad zipper, allowing for convenient removal of the seat pad for cleaning. Refer to the care labels on the fabric for specific washing instructions. Generally, machine wash cold on a delicate cycle with mild detergent. Do not use bleach. Tumble dry low or hang to dry.

Image: Easy-access zipper for seat pad removal.
Cleaning CupFolders:
The two CupFolders are dishwasher-safe for easy cleaning. Simply press the button to release them, wash, and reattach.
Cleaning the Shell and Harness:
Wipe the plastic and metal parts of the car seat shell with a damp cloth and mild soap. Do not use abrasive cleaners. The harness straps should be spot cleaned with a damp cloth and mild soap. Do not machine wash or immerse harness straps in water, as this can weaken them.
7. Troubleshooting
If you encounter any issues with your Chicco MyFit car seat, please refer to the following common troubleshooting tips:
- Difficulty Tightening Harness: Ensure the harness straps are not twisted and are routed correctly through the seat. Check that the chest clip is at armpit level and the buckle tongues are fully inserted into the crotch buckle.
- Car Seat Feels Loose After Installation: Recheck the installation steps. Ensure the LATCH connectors are securely attached or the vehicle belt is properly routed and tightened using the LockSure system. The car seat should not move more than 1 inch at the belt path. Verify the ReclineSure bubble levels indicate a correct angle.
- Headrest/Harness Adjustment Issues: Ensure the orange pull tab at the top of the headrest is fully squeezed when attempting to adjust. Check for any obstructions.
- Child Discomfort: Ensure the harness is not too tight or too loose. Adjust the headrest to the correct height. The ErgoBoost seat padding is designed for comfort, but ensure no clothing or other items are causing discomfort.
If you are unable to resolve an issue, contact Chicco customer service for assistance.
8. Specifications
| Specification | Value |
|---|---|
| Brand | Chicco |
| Model | MyFit |
| Item Dimensions (LxWxH) | 21 x 17.5 x 26 inches |
| Item Weight | 25 Pounds |
| Material | Metal, Plastic, Polyester |
| Installation Type | Belt lock-off or LATCH system |
| Orientation | Forward Facing |
| Harness Mode Weight Range | 25-65 lbs (11.4-29.5 kg) |
| Booster Mode Weight Range | 40-100 lbs (18-45.3 kg) |
9. Warranty and Support
For warranty information, product registration, or further assistance, please contact Chicco customer service. Keep your proof of purchase for any warranty claims.
You can typically find contact details on the Chicco official website or within the product packaging.





