Evenflo
for children 40-110 lbs. / 4 years and up

Big Kid®

Big Kid Highback 2-in-1 Belt-Positioning Booster Car Seat (Sprocket)

$44.99

In Stock

Sprocket
31911431

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Details

This amply padded highback Big Kid helps you ensure your vehicle's seat belt will be properly positioned across your child's chest and legs. The Big Kid also converts to a backless booster allowing you to keep your growing child safer, longer.

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EXCELLENCE & VALUE:

Trusted by Millions of Families for Nearly a Century

Made in USA with US & Global Components

Peace of Mind:

Expiration: 6 years

Warranty: 90 days

Returns: 30 days

Support:

Installation Manuals: Browse »

FREE Video Support: Book Now »

Why You’ll Love it

Go big or go home...

Perfect for your growing child, this seat belt booster combines the peace of mind parents require, with colorful options your child will love.

Product Details

Child Specs (40-110lbs)

SEAT BELT BOOSTER

  • Weight: 40 lbs-110 lbs (13.6-49.8 kg)
  • Height: 40-57 in. (102-145 cm)
  • Age: at least 4 years of age
  • Fit: Top of child's ears are at or below the top of the child restraint.

NO BACK BOOSTER

  • Weight: 40-110 lbs. (18-49.8 kg)
  • Height: 40-57 in. (102-145 cm)
  • Age: at least 4 years of age
  • Fit: Top of child's ears are at or below the top of the vehicle seat headrest.

CHILD

  • Age: At least four years of age

Product & Shipping Specs

  • Package Width: 16.5
  • Package Weight: 8.07
  • Package Depth: 11.25
  • Package Height: 19.25

Safety

Safety Testing

At Evenflo, we continue to go above and beyond government testing standards for car seats.

  • Side Impact Tested:Meets Evenflo’s proprietary side impact standards.
  • Designed and tested for structural integrity at energy levels approximately 2X the federal crash test standard.
  • FMVSS 213: Federal Motor Vehicle Safety Standards for Child Restraint Systems
  • FMVSS 302: Federal Motor Vehicle Safety Standards for Flammability of Interior Materials
  • CMVSS 302: Canada Motor Vehicle Safety Standard
  • CMVSS 213: Canada Motor Vehicle Safety Standard
  • Evenflo Temperature Testing: All current Evenflo car seats are tested for product integrity at both high and low temperatures.

Use & Care

Use & Care

Read all instructions and warnings on the product, product labels, and instruction manuals before use. Consult your vehicle owner’s manual to determine proper placement of child restraint in your vehicle and familiarize yourself with your vehicle’s components.

Browse Instruction Manuals »

Cleaning Instructions
  • DO NOT lubricate or immerse in water any part of this child restraint, unless rinsing is permitted
  • Plastic and metal 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 harness can be wiped clean with mild soap and water. Allow harness to air dry.
  • Machine wash the seat pad separately in cold water, delicate cycle. Tumble dry 10 to 15 minutes on low heat.
  • Periodically inspect and clean the restraint's crotch buckle of food, liquids, and other debris to ensure proper latching. Place the buckle in a cup of warm water and gently agitate the buckle back and forth. Press the red button several times while the buckle is in the water. Do not submerge the harness strap. To avoid damage to the buckle, do not clean the buckle with soap or detergents and do not use a lubricant.

Evenflo Big Kid® LX Belt-Positioning Booster Product Tour

Our Big Kid high back boosters are designed for children 40-110 lbs. Once your child has reached the size and age requirements, you can transition into the no-back version of this seat.

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BIG KID AMP SPROCKET is rated 4.5 out of 5 by 53.
Rated 5 out of 5 by from Comfortable I got this for my son who is 4 and we wanted to move him to a booster seat as he had outgrown his older car seat. This seat is comfortable, easy to get on and off and he puts the belt on by himself now and loves his new seat. It's easy to move to my other cars as well. No hassles.
Date published: 2020-03-03
Rated 4 out of 5 by from Super easy to install My son has this booster seat and he loves it. It very easy to install in the car. Our family loves it because we have several cars so it’s easy to move around. This booster is light weight which I love. It has a nice soft material in it. The material washes well.
Date published: 2019-12-07
Rated 5 out of 5 by from Light and budget friendly When my son was ready to transition to a booster seat, I had to find one that could fit three across in my Nissan Altima since I have two younger kids in infant seats and convertible car seats. This seat fit perfectly! It is one of the most narrow boosters I was able to find, yet my son who is in the 90th percentile at 7 years old fits excellent in it and says it is very comfortable. We have two cars so switching the seats between the cars has always been a chore that neither my husband or I like to do, but this seat is so light that it is a breeze to move. I am definitely very happy with my choice and so is my son and my wallet!
Date published: 2019-11-08
Rated 5 out of 5 by from Space saver I bought this booster seat for my daughter a couple months ago and I love it because the price is affordable, it’s space saver in my compact car and it keeps my daughter safe plus the colors are fun. I also love the fact that I can pull the back rest up or down to accommodate to my daughter’s height.
Date published: 2019-06-08
Rated 5 out of 5 by from Absolutely love it! It was so ridiculously affordable! I paid $30 for it at Walmart and I was actually kind of shocked because it is Evenflo which is one of the more popular name brands. The design for girls is super cute, my daughter loves it and is so excited to be using a big girl carseat now. It has two really nice and sturdy cup holders. It's lightweight but safe too and very easy to adjust when needed.
Date published: 2019-05-11
Rated 5 out of 5 by from My Kids Love Their New Boosters! We are so happy with our purchase of 2 of the Evenflo Amp Booster Car Seats! It's a high quality booster seat with an affordable price. That is not very common to find these days in car seats but Evenflo has done it! My children were ready to upgrade from the 5 point harness seats and after a bunch of research these seats were the best choice! They're very stylish, modern, and look great in my SUV! My kids are so excited when we run errands so that they can sit in their new seats! The first day that they arrived, they sat in them in the living room for almost an hour watching cartoons! So I'd say they're very comfortable! The safety features ease my mind! Plus assembling it was extremely easy! I've been and will be purchasing more Evenflo products for years to come!
Date published: 2019-04-09
Rated 5 out of 5 by from I recently purchased for my daughter who is almost 4. She was getting too tall for her other seat so we went with this one. The price is awesome and so much more backseat space with this seat. No to mention my daughter loves her new seat. It has an awesome spot to keep the belt so your kid doesn't remove it and two sturdy cup holders.
Date published: 2019-03-07
Rated 4 out of 5 by from It does it's job. My tall 7 year old fits in it fine. It is light weight if you need to move it around, the back is adjustable for taller kids, or it can come off to be a backless booster. There is a seat belt holder for backless boosters, but it isn't the best. The down side is that it feels pretty flimsy compared to a structured high back booster.
Date published: 2019-02-07
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