Introduction

The Evenflo Big Kid LX Booster Seat is designed to provide safety and comfort for growing children, accommodating kids weighing between 40 to 110 pounds. This booster seat features a secure, adjustable headrest and a two-in-one design that easily transitions from a high-back to a backless booster. Its lightweight construction allows for easy installation and portability, making it ideal for families on the go. The cost of the Evenflo Big Kid LX Booster Seat is approximately $69.99.

Detailed Specifications 

• Weight Range: 40-120 pounds
• Height Range: 40-57 inches
• Modes: High-back and backless booster
• Installation: One-hand front adjust latch system for easy installation
• Material: Durable plastic and fabric
• Color Options: Multiple colors available
• Certifications: Meets/exceeds all applicable federal safety standards
• Warranty: 2-year limited warranty

Booster Seat Features

Front

Back

1. Shoulder Belt Guide
2. Seat Pad
3. Armrest
4. Elastic Cup Holder
5. Adjustment Handle
6. Instruction Storage Area
7. Shoulder Belt Clip

Warning

• DO NOT use the cup holder to store cans, bottles, or hard containers. Only for use with soft cups.
• DO NOT place any cups that contain hot liquids in the cup holder.
• DO NOT attach additional padding, toys, or other devices to the booster seat. Items not tested with the booster seat could injure the child.

Description

The Evenflo Big Kid LX Booster Seat focuses on safety and comfort with a one-hand front adjust latch system for secure and easy installation. The high-back mode offers added protection, while the backless mode provides more freedom as the child grows. The booster includes adjustable head and armrests, optimizing comfort for long rides. Its machine-washable pad ensures easy cleaning, and the compact design allows for convenient storage when not in use.

Attaching the Seat Pad

1. Position seat facing up. Wrap the seat pad around the front of the seat. Make sure the seat pad is straight and positioned correctly on the seat.
2. Connect elastic loops to hooks on the underside of the seat.
3. Wrap the seat pad around the back of the seat. Make sure the seat pad is straight and positioned correctly on the seat. Connect elastic loops to hooks on the underside of the seat.

Assembling Backrest

1. Assemble the backrest. Insert three posts on the headrest into the backrest, as shown. Make certain the headrest clicks securely into the backrest. Note: This is a one-time assembly and may require additional force to connect properly.
2. Install pull handle. Align tabs on pull handle with the slots on the back of the headrest. Press pull handle against the back of the headrest and slide upward until the tabs click into place.

Attaching the Backrest Pad

Wrap the backrest pad around the back. Make sure the  pad is straight and positioned evenly on the seat.

1. Pull the backrest pad down over the top of backrest. Attach the headrest pad to the hooks.
2. Connect elastic loops to hooks on the top of the headrest on both sides.
3. Connect elastic loops to hooks on the middle of the backrest on both sides.
4. Pull the pad around the bottom corner and connect elastic loops to hooks.

Assembling Your Booster Seat

1. Install the backrest. Slide the backrest assembly into the base. Make certain the backrest locks into place.
2. Check your work. Inspect the booster seat to make sure that the headrest is securely attached to the backrest, the seat pad is hooked into place, and that the backrest assembly is securely locked into the base. Repeat any assembly steps as necessary.

When to Put Your Child in a Booster Seat

Booster seats raise the child up and help to position the vehicle lap and shoulder belt correctly. When the child is properly restrained in a booster seat, their risk of injury in all types of crashes is reduced, as the lap and shoulder belt provides excellent restraint of both the upper and lower torsos. 
It is important for the child to sit properly within the vehicle seat belts. When the vehicle seat belt is buckled, the lap belt should be low on the hips, just touching the thighs, and the shoulder belt should lie across the middle of the shoulder. If the child leans out or moves the belt behind the back or places it under the arm, it will not provide the intended restraint.
There are a number of things to consider when deciding whether the child is ready to sit in a booster seat, including: the weight and height rating on their current child seat, the child’s own weight and height, their maturity, and the seating positions available in your vehicle.
How is a booster seat used?
Using a booster seat is very similar to buckling yourself into the vehicle:

• Read the instruction manuals for both the booster seat and the vehicle before you start.
• Put the booster in the back seat in a location with a lap and shoulder belt. Never use a booster with only a lap belt, as this could cause serious injuries.
• After the child is in the booster, pull the lap and shoulder belt across him/her and buckle it.
• Check that the shoulder belt lies across the middle of the shoulder and that the lap belt is low on the hips, just touching the thighs.

Using Your Booster Seat with the Backrest

Child Requirements

• Weight: 18 – 49.8 kg (40 – 110 lbs.)
• Height: 102 – 145 cm (40 – 57 in.) AND the tops of child’s ears are below the top of the booster seat headrest.
• Age: At least four years old

• 

How can you tell if your child is ready to transition to a booster seat? 
You should consider using a booster seat if the following conditions apply:

• The child is mature enough to sit in the booster seat and not put the belts under their arm or behind their back.
• The child is approaching the weight or height limit of the booster seat they are currently using.
• If you have a vehicle that does not have a tether anchorage but has lap/shoulder belts available in the back seat, a booster seat may provide better protection than an internal harness seat without the tether.

Installation Checklist

1. Place the booster seat on the vehicle seat.
2. Set the child in the booster seat. Make sure the child’s back and bottom are flat against the back and bottom surfaces of the booster seat.

3. Adjust the back of the booster, if necessary. Adjust the backrest so the shoulder belt guides are level with the top of the child’s shoulders. This will cause the shoulder belt to properly lay midway between the child’s shoulder and neck (see Adjusting the Backrest, p. 27).
   WARNING: The shoulder belt MUST NOT cross the child’s neck or fall off the child’s shoulder. If you can not adjust the shoulder belt to properly lay midway between the child’s shoulder and neck, try another seating location or do not use the booster seat. 

   

4. Secure the child and booster seat to the vehicle seat.
   Stretch the lap/shoulder belt across the child and fasten the buckle. Make certain the shoulder belt is threaded through the shoulder belt guide.
5. Check your work.
   Make sure the lap belt is stretched low and snug across the child’s hips, beneath the armrests, and fastened into the buckle (see p. 22). The shoulder belt must cross the child midway between his/her shoulder and neck.
   Important: Always secure the booster seat with the vehicle seat belts when not occupied. An unsecured booster seat can fly into and injure other occupants in the event of a crash.

Using Your Booster Seat without the Backrest

Child Requirements

• Weight: 18 – 49.8 kg (40 – 110 lbs.)
• Height: 102 – 145 cm (40 – 57 in.) tall AND the tops of child’s ears are below top of the vehicle headrest.
• Age: At least four years old

Installation Checklist

1. Remove the backrest from the booster seat.(See Removing the Backrest, p. 26.)
2. Place the booster seat on the vehicle seat.
3. Set the child in the booster seat.
   Make sure the child’s back is flat against the vehicle seat,and the child’s bottom is flat against the booster seat.
4. Secure the child and booster seat to the vehicle seat.
   Stretch the lap/shoulder belt across the child and fasten the buckle beneath the armrests.

5. Use the shoulder belt clip, if necessary.
   If the shoulder belt does not properly lay midway between the child’s shoulder and neck, attach and adjust the shoulder belt clip (see Using the Shoulder Belt Clip, p. 28).
   WARNING: The shoulder belt MUST NOT cross the child’s neck or fall off the child’s shoulder. If you can not adjust the shoulder belt to properly lay midway between the child’s shoulder and neck, try another seating location or do not use the booster seat.

   

6. Check your work.
   Make sure the lap belt is stretched low and snug across the child’s hips, beneath the armrests, and fastened into the buckle. The shoulder belt must cross the child midway between his/her shoulder and neck. Note: If the vehicle’s shoulder belt naturally crosses the child’s shoulder, you do not need to use the shoulder belt clip.

Important
Always secure the booster seat with the vehicle seat belts when not occupied. An unsecured booster seat can fly into and injure other occupants in the event of a crash.

Removing the Backrest

1. Lay the booster seat on its side.
2. Squeeze the lever on the bottom of the base and remove the backrest from the base.

Important
Store the backrest properly when not in use.

Adjusting the Backrest

To adjust the backrest, pull and hold the adjustment handle then slide the backrest up or down. The backrest is positioned properly when the bottom of the shoulder belt guides are even with the top of child’s shoulders.

Using the Shoulder Belt Clip

1. Thread the looped end of the shoulder belt clip belt through the anchor point on bottom of the booster.
2. Thread the shoulder belt clip through the loop at the end of the belt and pull until tight.
3. Place booster on the vehicle seat and attach the shoulder belt clip to the vehicle shoulder belt.
4. Pull the adjustment strap until belt clip is even with the child’s shoulder and the vehicle shoulder belt lays across the child’s chest midway between his/her shoulder and neck.

Setup Guide

1. Unpacking: Remove the booster seat from the packaging.
2. High-Back Mode Setup: Attach the backrest to the base using the provided connectors.
3. Backless Mode Setup: Detach the backrest from the base.
4. Installation: Use the one-hand front adjust latch system to secure the seat with the vehicle's seat belt.
5. Adjustments: Adjust the headrest and armrests according to your child’s height.
6. Testing: Ensure the seat is securely installed by gently pulling on it.

Care and Cleaning

• Plastic parts may be wiped clean with mild soap and water and dried with a soft cloth. Do not use abrasive cleaners or solvents.
• Take care not to damage any labels.
• The seat pad can be machine washed separately in cold water, delicate cycle, tumble dry 10 – 15 minutes on low heat.
• NEVER use booster seat without the seat pad.
• To protect the booster seat from damage caused by weather, rodents, and other elements common to garages, the outdoors, and other storage locations, remove the seat pad and thoroughly clean the booster seat and pad prior to storage. Take care to clean in the areas where crumbs and other debris tend to accumulate.

Tip: To help protect the vehicle upholstery, place a towel beneath and behind the booster seat.  

Replacement Parts

Not available on all models. You can order replacement parts on-line at https://www.evenflo.com or contact Evenflo. When you contact us, please have the product model number and date of manufacture (found on the bottom of the booster seat).

Proper Disposal of this Booster seat
When this booster seat reaches the expiration date found on the date of manufacture label, Evenflo encourages you to dispose of it properly. Most components of this booster seat are recyclable.

1. Remove all fabric and padding.
2. Remove all screws and disassemble the booster seat.
3. Recycle all fabric, padding, plastic, foam and metal parts, if accepted by your local recycling center. Responsibly discard the rest.

If your local recycling center won’t accept the padding, you may dispose of it in the landfill.
To prevent injury due to hidden damage, lost instructions, outdated technology, etc., discontinue use of this booster seat after the expiration date on the label or if it has been involved in a crash.

Storing Your Instructions

Troubleshooting

• Loose Installation: Confirm that the latch system is fully engaged and tighten as needed.
• Incorrect Mode: Ensure the correct mode (high-back or backless) is used based on your child's height and weight.

Warnings:

• Follow manufacturer instructions for proper installation.
• Always fasten the vehicle’s seat belt when using the booster seat.
• Inspect the seat regularly for signs of wear or damage.

Evenflo Big Kid LX Booster Seat Warranty

For a period of 90 days from the original purchase of this Product, Evenflo warrants to the original end user (“Purchaser”) this Product (including any accessories) against defects in material or workmanship. Evenflo’s sole obligation under this express limited warranty shall be, at Evenflo’s option, to repair or replace any Product that is determined to be defective by Evenflo and determined to be covered by this warranty.

Pros & Cons

Pros

• Versatile Modes: Functions as both a high-back and backless booster.
• Easy Installation: Features a one-hand front adjust latch system.
• Adjustable: Headrest and armrests adjust for comfort.
• Affordable: Competitively priced compared to similar products.
• Durable: Made from high-quality materials designed for daily use.

Cons

• Limited Color Options: Fewer choices compared to other brands.
• Bulky Design: Can take up more space in smaller vehicles when in high-back mode.
• Heavy: May be cumbersome to transfer between vehicles.

Customer Reviews

Parents generally praise the Evenflo Big Kid LX Booster Seat for its ease of use, comfort, and safety. Reviewers appreciate the adjustable headrest and armrests, noting the comfort and support they provide. However, some parents have expressed concerns about the seat’s bulkiness, making it less suitable for smaller vehicles. Common complaints also include the limited color options and the seat’s weight when moving it between cars.