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Britax Pioneer G1.1 Harness-2-Booster Car Seat - Summit

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Seat weight: 21 lbs
Harness Mode: 2 years & 25 lbs to 70 lbs
Booster Mode: 40-110 lbs
Dimensions (in): 19 W x 28-36 H x 21 D

What's Included: Integrated cup holders


Side Impact Protection

Two layers of Side Impact Protection absorb energy and shield your child from the most severe type of collision.

Impact-Absorbing Base

The impact-absorbing base compresses to reduce the force of a collision

Easy Adjust

Quick-adjust 2-position buckle moves outward easily as your child gets bigger. No-rethread 9-position harness easily adjusts to grow with your child.

Patented V-Shaped Tether

Minimizes seat rotation with a unique two-strap design and staged-release stitches that slow and reduce forward movement during a crash.

The Pioneer Harness-2-Booster Seat is an excellent choice for making travel with your growing child safe, comfortable and hassle-free. Our comprehensive SafeCell Impact Protection surrounds your child in safety components that work together to protect well beyond the established federal safety standards. And Complete Side Impact Protection PLUS provides an advanced layer of protection with a protective shell and an energy-absorbing foam headrest designed to keep your child’s head and neck extra secure. Installation is made simple with Easy-On / Easy-Off LATCH Connectors that lock into place with an audible click and are easily released with the push of a button.

The proper fit is essential when it comes to safety, so the Pioneer includes our Quick-Adjust, 8-Position Harness and 2-Position Buckle to keep up with your growing child. Plush Foam Padding provides premium comfort at every touch point and the Integrated Cup Holders and Storage keep snacks, drinks and toys close at hand. There is even a simple Front-Adjust Recline so your toddler can sleep in comfort when the time is right.

The Pioneer Harness-2-Booster Seat can be used in Harness Mode for children 2 years old and 25 lbs up to 70 lbs or in Booster Mode for children 40 lbs up to 110 lbs. When your child is ready for Booster Mode, the harness can be safely tucked away the within the seat to easily transition the Pioneer into a high-back Booster without any hassles. The Pioneer Harness-2-Booster Seat is designed to provide everything you need to feel confident that your growing child is safe and comfy when you are on the move.

Top 5 Features:

  • SafeCell Impact Protection is an integrated system of safety components that work together to protect your child well beyond the federal safety standards. Including an Impact Absorbing Base and Tether, an Impact Stabilizing Steel Frame, and Complete Side Impact Protection PLUS, SafeCell means your child is surrounded in best-in-class safety.
  • SafeCell Complete Side Impact Protection PLUS provides an advanced level of protection: a deep protective shell absorbs crash forces and shields your child from debris, and an energy-absorbing headrest keeps your child’s head and neck secure.
  • Quick-Adjust, 8-Position Harness and 2-Position Buckle allows you to easily move the harness upward and buckle outward for a comfortable, secure fit as your child grows.
  • Front-Adjust Recline easily alters the seat angle for your child’s comfort.
  • Integrated Cup Holders and Storage keep drinks, snacks and toys close at hand.
Safe and Secure
  • SafeCell Impact Protection is an integrated system of safety components that work together to protect your child beyond the federal safety standards. Including an Impact Absorbing Base and Tether, an Impact Stabilizing Steel Frame, and Complete Side Impact Protection PLUS, SafeCell means your child is surrounded in best-in-class safety.
  • SafeCell Complete Side Impact Protection PLUS provides an advanced level of protection: a deep protective shell absorbs crash forces and shields your child from debris, and an energy-absorbing headrest keeps your child’s head and neck secure.
  • SafeCell Impact Absorbing Base compresses to absorb crash energy and counteract forward movement keeping your child clear from the seat in front of them.
  • SafeCell Impact Stabilizing Steel Frame gives you peace of mind knowing there is strength where you want it most, through the spine of the car seat reducing forward flex and at the connection points to the vehicle.
  • SafeCell Impact Absorbing Tether minimizes seat rotation with our unique two-strap design and slows forward movement with Britax’s patented rows of stitching that “give-way” one at a time.
  • Compatible with SecureGuardTM Clip to keep vehicle seat belt properly positioned on your child’s hips when in Booster mode minimizing the risk of abdominal injury (accessory sold separately).
  • Safety Proudly Made in the USA.
Fit and Comfort
  • Quick-Adjust, 8-Position Harness and 2-Position Buckle allows you to easily move the harness upward and buckle outward for a comfortable, secure fit as your child grows.
  • Front-Adjust Recline easily alters the seat angle for your child’s comfort
  • Plush Foam Padding in the cover, buckle pad, and shoulder pads surround your child in comfort at every touch point.
Smart and Simple
  • Integrated Cup Holders and Storage keeps drinks, snacks and toys close at hand.
  • EZ-Remove Cover for cleaning convenience.
  • Hassle Free Transition easily converts from Harness to Booster by safely tucking away buckles and straps within the seat.
  • Easy-On / Easy-Off LATCH Connectors locks into place with an audible click to both secure the seat in Harness Mode and prevent it from becoming a projectile when unoccupied in Booster Mode.
  • Color-Coded, Easy-Access Belt Paths simplify vehicle seat belt installation.
  • Tangle-Free, Five-Point Harness prevents the straps from twisting making it easier to load your child into the seat and ensuring a safer ride.
Aircraft Travel Certified when in Harness Mode.

out of 5.0
297 Reviews
Ratings Snapshot
5 Star
73% (216)
4 Star
17% (50)
3 Star
5% (15)
2 Star
2% (6)
1 Star
3% (10)
of Reviewers
Heavy, but great seat
By Sarah
from Yuma, Arizona
on June 27, 2020
Verified Buyer
This seat is heavy, but most Britax seats are, due to the steel frames. I liked this seat, but it could use more cushion.
Great Seat
By Amy
from Monroe, Washington
on June 10, 2020
Verified Buyer
We do love this seat. Its easy to install in our Dodge Caravan and Mazda 3. I have not been able to get a good install in our F150 super crew which is ok because I just use it in the van.
Great booster
By Jessica
from Middletown, DE
on February 19, 2020
Verified Buyer
This booster was easy to install and fits great in a multitude of car models. Held up in a rear-end car crash (though had to be replaced due to car seats only being good for one accident)
  • Easy to install
  • Comfortable
Safe Seat
By Stacy
from Ohio
on February 12, 2020
Verified Buyer
We have used this with the 5pt harness feature for the last 2 years for my son (age 8 now, but small for his age). Seat is safe which is the #1 priority. Easy for him to get in and out of. Cupholders are great, they do not detach so no issues with them coming off. Only slight complaint is the headrest makes some noise when he is not in the seat, if you google the issue there are suggestions to helping stop the noise that work very well. Overall very pleased.
Great harness booster
By RoseFam
from Florida
on January 23, 2020
Verified Buyer
My son outgrew his five point harness car seat so we purchased this booster. It came earlier as expected. Its cute, easy to install, and my son loves it. Its more spacious and has cup holders. Its also got exceptional safety ratings. Would def recommend!
Britax Carseat
By Megan
from Augusta, GA
on January 2, 2020
Verified Buyer
Britax never disappoints!! Awesome car seat as expected. The shipping from albeebaby.com was super fast!
Britax Pioneer G1.1
By Annie
from OR
on December 21, 2019
Verified Buyer
Exactly what we were looking for. Nice quality, easy to install and comfortable for little one. Seat cover appears easy to remove for washing but havent had to do so just yet.
Everything we've come to expect from a great brand!
By Liz
from Knoxville, Tennessee
on December 15, 2019
Verified Buyer
The car seat is well made and stands up to tough toddlers! No car seat is easy to uninstall and pull apart for washing, but this one is as easy as it can be. The cupholders are great and I wish our previous Britax seats (for earlier stages) had come with holders like these.
  • Sturdy construction
  • Good quality
Cheap model
By Lori
from Minnesota
on December 9, 2019
Verified Buyer
We always buy Britax and got this as a Black Friday deal. If it wasnt so large I would have returned it. Its not the quality Ive grown accustomed to with Britax. It seems cheap. The straps are rough and not the smooth, nice straps in the marathon and pavilion seats I have. Its hard to get a tight fit in the car (and yes my seat belts lock and I followed the instructions exactly). It does fit according to the specs in the manual but just not as snug as Id like. I would not purchase it again. Spend the extra money and get the more expensive one.
  • Decent price
Great seat for older toddler - school age
By Catherine
from Los Angeles
on September 25, 2019
Verified Buyer
We bought one of these seats for my son when he was 3 and were still using it at 7. He uses it with a seatbelt now.
It was time to get a new seat for my big 2.5 year old and the other seats I researched did not compare. They didnt recline, didnt have arm rests, no cup holders, or didnt offer enough padding. This seat has it all. Its a comfortable ride for both of my kids and will give them room to grow. I also feel the design of the seat will keep my kids safe.
Britax Pioneer - Great Booster
By Samantha
from Plymouth Meeting, PA
on August 23, 2019
Verified Buyer
The Pioneer is awesome. This seat may not have as many bells and whistles as Frontier or Pinnacle (no click tight) but its a great seat for a great price point. Love the built in cup holders, and the fact that it can be used for both harness mode and booster so it will last longer. I like that you can use LATCH to keep the seat in place once child is in booster mode (so the seat doesnt move around if/when youre driving without the child in the car) ...also, I dont like the gray rubber thingies that come on Frontier/Pinnacle straps. Pioneer does NOT have them so thats a good thing in my opinion.
The last car seat I’ll ever need to buy!
By Bri
from Clearwater, Florida
on June 28, 2019
Verified Buyer
Im very happy with this harnessed booster seat, I bought 2 others before this elsewhere and ended up returning both because I was so unimpressed with the quality and safety. I love that this seat can still be hooked up using the latch system, the way it connects to the back of the seat is also very unique and its nice not having to try and squeeze the buckle in the small space under the headrest. I feel like my daughter is very safe in this seat, its going to grow with her and color/print is adorable.
Customer Images
  • Booster seat that attaches to the vehicle using the latch system
  • Grows with child
  • The material is soft and comfortable, doesn?t retain much heat so even if the car is hot from sitting in Florida sunshine the seat doesn?t feel hot to my daughters skin
Best Uses
  • My daughter is 4, 38 pounds and 44 inches and this seat is perfect for her
  • Small spot on the top back of the backrest where styrofoam is visible but it?s only noticeable when the seat isn?t installed. Doesn?t affect quality or safety so a non-issue
Britax carseat
from Lancaster,OH
on June 26, 2019
Verified Buyer
Love it and my grandson is happy riding in it!
  • It's a bit heavy.
Super sturdy, very easy to install and switch cars
By jojo
from DAYTON, Ohio
on June 10, 2019
Verified Buyer
We love this Britax car seat! Super comfortable and sturdy when installed. We have 3 cars and always struggles when we have to switch cars and the carseats. This one is easy to unlacth and re-buckle.
We prefer this eat over the Graco Nautilus or similar as it is extremely easy to use and install and we have always been able to get a solid install in various vehicles.
Spend the extra $ for click tight
By Elyce
from Suwanee, Georgia
on May 28, 2019
Verified Buyer
Hard to install
  • Difficult to install
Perfect toddler transition seat
By Mary
from Tennessee
on May 22, 2019
Verified Buyer
Easy to install between two vehicles. Lightweight, and my 3.5 year old is very comfortable in this seat, even for 3 hour car trips. Ordering a second for my husbands car!
Love the seat but falling apart!
By Bpender
from Bokeelia FL
on May 20, 2019
Verified Buyer
We have two Pioneer seats for my 4 and 6 year old. We have loved the seats, but the side foam pieces have all broken. I wouldn't say my kids are rough on their seats either. They foam pieces stay under the fabric but whenever I take them apart to clean they are extremely hard to get all the foam pieces in place. Going to have to buy new seats and I'm not sure what to get because I thought for sure these would be our last car seats for my kids!
This product review was collected by the manufacturer.
By Tylyn
from MI
on May 1, 2019
Verified Buyer
Great seat. Its definitely bulkier than other seats available but totally worth it. Kids love the cup holders and little snack/toy holders.
We own 3
By Casey
from Placerville, CA
on April 24, 2019
Verified Buyer
Britax has always been our choice for our daughter since day 1. This is our 3rd model of Britax and she is now 6. Love this item. We have one in each main vehicle and now have one for the grandparents when they need one.
Great and affordable Carseat
By Giacomo R.
from CA
on April 15, 2019
Verified Buyer
I was looking to a new carseat after my boy turned 3 1/2 and this one matched the quality and price I was looking for. Very easy to install, with latches and with the belt. 2 cups holder are very useful, but more important, it has all the safety feature I was looking for!!!! I will buy another one when the time comes for my 1 1/2 year old boy!

Great transition booster
By Jamie
from Los Angeles
on April 14, 2019
Verified Buyer
Previously had the Britax Marathon convertible car seat and wanted to step it up to a booster. My kid is 40lbs and 42 inches tall at almost 5 yo. Things I wanted and got with this booster: Latch connection, harness, cup holders, removable seat cover, and the Britax engineering. I decided to forgo the click tight since I did not plan to ever take this booster out of my car. I wanted to keep the 5pt harness for the safety and my kid could buckle herself in and out the convertible and could easily do the same here.
One minor issue...
By Lauren
from Pottstown Pennsylvania
on April 5, 2019
Verified Buyer
This seat is great! It was very easy to install and does not move once hooked up. The only issue I have is it tends to be difficult to tighten.
By Laura
from Denver, CO
on March 31, 2019
Verified Buyer
Typical of britax, this seat is great quality and user friendly. My 7yr old is still able to use it in 5pt harness mode. It's easy to clean and install.
By Vikki
from Highland Park, Illinois
on March 30, 2019
Verified Buyer
Very happy with the car seat and as always Albee Babys very timely delivery.
Amazing Booster car seat
By Diane V.
from Colorado Springs
on February 14, 2019
Verified Buyer
Fantastic car / booster seat!! Definitely worth the purchase!! 5 star product for sure and the grandson is protected yet feels like a big boy!
Good price for Britax
By Susan
from Florida
on January 23, 2019
Verified Buyer
We always used Britax and as my granddaughter grew. I would have given 5 stars, but the installation is hard at first and I hesitate to ever take it out of the car....
Britax Pioneer is amazing!
By Dana
from North Carolina
on January 22, 2019
Verified Buyer
I ordered the Britax Pioneer for my 6 year old son because I feel safer knowing he is in a 5-point harness. He is on the small side at 37lbs and 43 tall. I did so much research and ultimatly chose this one. I was skeptical at first because there were quite a bit of negative reviews about the seat not being secure with the lapbelt. I installed the seat with ease and it is very secure. It fits perfectly in my 2015 Honda Odyssey with leather seats. Shipping was also very fast. Do not hesitate to save some cash and get the Pioneer!
Good seat, second time buying it
By K
from Ventura, CA
on January 12, 2019
Verified Buyer
My older child has this same seat in another color. It is very easy to install. We bought the other one several years ago and it is still going strong. It was an easy decision for the second child. It is very heavy compared to say, Graco Nautilus or Argo, but easier to install and tighten and fits for a longer period of time. It is also not quite as wide, which is nice for a person with a narrower car. I prefer Britax car seats and have owned several others.
By Megs
from Sand springs, ok
on December 22, 2018
Verified Buyer
Perfect booster seat to still be able to use the 5 point harness system as long as we can.
This product review was collected by the manufacturer.
Love this Booster Car Seat!
By Stephanie
from Long Island, NY
on November 29, 2018
Verified Buyer
This Britax booster seat made my 3 year old super happy. He was exited to have a big boy seat with cup holders just like his brother. The harness adjusts easily and it is locked into place with the tethers in my car.
Love this seat
By Terra
from Florida
on November 24, 2018
Verified Buyer
I wanted to get this seat for the longest time. I've got a tall heavy boy (47 pounds / 46 inches) he was in a Diono but he was so cramped up.

Customer Images
  • I love the recline option, that keeps his head from slumping forward if he falls asleep. Cup holders are great. Sturdy feel all around.
  • Con(for some prople): This is a big seat, you can't put another seat next to it (at least not in the Toyota Highlander.)
Safe and comfortable
By M0mMy
from Buena Park, CA
on November 23, 2018
Verified Buyer
Great value for safety and comfort. My son loves this carseat.
superior protection
By 1badshreda
from san diego
on November 15, 2018
Verified Buyer
Purchased two,one for moma,one for day care.Have had them for four days now, work great. Only the best for our little ones right?
This product review was collected by the manufacturer.
Horrible rattle
By SJSokc
from OKC, OK
on November 14, 2018
Verified Buyer
I've had this in my car for about 8 weeks and the rattle is enough to drive me crazy. Sadly we are returning the seat.
This product review was collected by the manufacturer.
Very comfortable
By Rose
from Miami
on November 11, 2018
Verified Buyer
Car seat is very comfortable and easy to use.
Unbeatable Safety and Value
By Nancy
from Kirkland, WA
on October 20, 2018
Verified Buyer
We have four of the Pioneer seats. We love that they're Britax at an affordable price point. They're easy to install, use, and clean.
  • Affordable
  • Easy to install
  • Easy to use
  • Easy to clean
  • Good reputation
  • Wish the armrest is moveable
Perfect car seat
By Erica
from HELOTES, Texas
on September 13, 2018
Verified Buyer
This fit perfectly in my car and my daughter was happy I got her a comfortable seat. Installation was a breeZe and I feel great knowing she is safe.
By Gabrielle G.
from Minneapolis, MN
on September 13, 2018
Verified Buyer
Bought this for my 3 year old. I love how sturdy the seat is. I also really like the fabric. I think it's comfy for my son. He can see around the side bumpers which is nice too.
Not as easy to install as the videos make it sound
By Theggs
from Toronto, Canada
on September 10, 2018
Verified Buyer
I spent at least an hour installing this in my car and it's not the first Britax car seat I've had. I strongly suggest you test your instructions on a novice and use pictures of the actual car seats in your instruction book ... not just diagrams. Some of it is just incomplete and it takes forever to sort it out, e.g. the release lever for loosening the straps has to be used in conjunction with the small release button... this is NOT well explained, visuals are NOT adequate.
This product review was collected by the manufacturer.
Best car seat!
By Jennifer
from Sand springs, ok
on September 8, 2018
Verified Buyer
I had been looking at this car seat and several other seats similar to it. I have always heard good things about this brand but have never owned one. I finally bit the bullet during the sale and bought it for my 2 yr old. I absolutely LOVE it! It is a tad bit heavy but I can deal with that to have a good quality and safe car seat. My son is a little bigger than your average 2 yr old and this seat has so much room. The first time he rode in he could t stop telling me how comfy it was. I wont have to buy another seat this one will grow with him. Super easy to install also.
It’s better than graco but not as great as clicktight
By Leigh
from Canton ga
on September 4, 2018
Verified Buyer
This seat fits our needs but I do not like to move it from car to car. Its not heavy but getting the chair tight in the seat takes some work. I should have spent a little more and got the click tight version. Its way easier. I still gave this seat 4 stars because it is a good seat and my daughter loves the cup holders and arm rests.
  • Cup holder and arm rests
  • Not as heavy as convertible seats
Best Uses
  • When it stays in the same seat and ou don?t have to move it from car to car daily
  • It?s not clicktight but that?s not the chairs fault it?s mine for not buying the correct version
Great large carseat
By Cinsy
from California
on August 31, 2018
Verified Buyer
Great large car seat. Fits perfectly in our van. Easy install.
Britax Pioneer
By Jill
from Carthage, MO
on August 31, 2018
Verified Buyer
This carseat has been perfect for our needs! Prices were awesome! Checkout and shipping were fast and easy!
Exceptional safety for its price!
By Holly
from Wilmington, NC
on August 29, 2018
Verified Buyer
We are very happy with this seat and the safety and security it provides at a reasonable price point. The cup holders on each side are an added bonus! Highly recommend.
Excellent Quality
By Sarah
from Boone, NC
on August 25, 2018
Verified Buyer
This is the second Pioneer I've purchased. I found out that my granddaughter had outgrown her Boulevard and was sitting in a hand-me-down all plastic seat in mom's car. I just feel like Britax seats are much safer. And they're an exceptional value for the quality of the product.
Great value and Love Britax
By Hanna
from Pittsburgh
on August 24, 2018
Verified Buyer
Perfect experience... Great Britax product at great prices. Easy to install and love the double cup holders and well constructed. Note the latch strap does not come with it if you plan to use one. Albee always ships quickly I recommend them to all of my parent friends .
Grandma is happy!
By Lois
from Atlanta, Georgia
on August 22, 2018
Verified Buyer
I bought this seat to have in my car for my grandson. I'm familiar with Britax car seats in general, as I had purchased 2 previously for my son and daughter in law that have been in use for a while now, and are great. I actually installed this myself, and unlike other users, found absolutely no issues with the process. Other than the weight of getting it into the house after delivery, and then into the car, it was very easy. And thank goodness for the weight as it is definitely a very sturdy and protective seat. I would highly recommend this to other grandparents and parents
Britax Pioneer
By Mary
from Fort Collins, Colorado
on August 18, 2018
Verified Buyer
This is a perfect car seat for our three year old. The safety features are very secure and the seat is comfortable for our granddaughter. It is also very easy to install.
Another top quality seat from Britax
By Gary
from Warsaw, NY
on August 17, 2018
Verified Buyer
Britax quality was quite evident in this seat. The metal frame makes it heavier than some, but the added security is worth it. Overall construction is top notch. The push button latches make hooking to the seat anchors easy. With two grandchildren to transport, this makes Britax seat nbr. 2, and the quality of the first seat is what sold us on buying this seat.
  • High quality construction for maximum security and usable for 9 years.
  • Directions a little difficult to understand, but a phone call to customer service solved the problem.
Great seat!
By Holly
from Texas
on August 17, 2018
Verified Buyer
This is a great booster seat with harness for my 4 year old. Seat back height adjust easily! Feels sturdy and safe:)
Thinking of buying another one with out the harness for my 6 year old.
  • Height adjust easily
  • Son can buckle himself
  • Son cannot release the buckle on his own.

1 Question & 1 Answer
Stephanie Felts
from OK asked:
January 23, 2019
What is the height limitation on this seat in harness position.
Child Weight - Forward Facing Harness 2 years and 25, up to 70 lbs Child Weight - Booster 40 - 110 lbs Child Standing Height - Forward Facing Harness 30 - 58" Child Standing Height - Booster 45 - 62" Child Seated Shoulder Height - Forward Facing Harness 12.5 - 20.5" Child Seated Shoulder Height - Booster 15 - 23"
Submitted by: Ilan Liipper on January 23, 2019

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