Britax Pioneer G1.1 Harness Booster Car Seat - Oasis

This item is discontinued.
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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.
Product Reviews
out of 5.0
192 Reviews
Ratings Snapshot
of Reviewers
Yuma, Arizona
Verified Buyer
Heavy, but great seat
June 27, 2020
This seat is heavy, but most Britax seats are, due to the steel frames. I liked this seat, but it could use more cushion.
Monroe, Washington
Verified Buyer
Great Seat
June 10, 2020
We do love this seat. It’s 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.
Middletown, DE
Verified Buyer
Great booster
February 19, 2020
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
Verified Buyer
Safe Seat
February 12, 2020
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.
Verified Buyer
Great harness booster
January 23, 2020
My son outgrew his five point harness car seat so we purchased this booster. It came earlier as expected. It’s cute, easy to install, and my son loves it. It’s more spacious and has cup holders. It’s also got exceptional safety ratings. Would def recommend!
Augusta, GA
Verified Buyer
Britax Carseat
January 2, 2020
Britax never disappoints!! Awesome car seat as expected. The shipping from was super fast!
Verified Buyer
Britax Pioneer G1.1
December 21, 2019
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 haven’t had to do so just yet.
Knoxville, Tennessee
Verified Buyer
Everything we've come to expect from a great brand!
December 15, 2019
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
Verified Buyer
Cheap model
December 9, 2019
We always buy Britax and got this as a Black Friday deal. If it wasn’t so large I would have returned it. It’s not the quality I’ve 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. It’s 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 I’d like. I would not purchase it again. Spend the extra money and get the more expensive one.
  • Decent price
Los Angeles
Verified Buyer
Great seat for older toddler - school age
September 25, 2019
We bought one of these seats for my son when he was 3 and we’re 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 didn’t recline, didn’t have arm rests, no cup holders, or didn’t offer enough padding. This seat has it all. It’s 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.
Plymouth Meeting, PA
Verified Buyer
Britax Pioneer - Great Booster
August 23, 2019
The Pioneer is awesome. This seat may not have as many bells and whistles as Frontier or Pinnacle (no click tight) but it’s 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 doesn’t move around if/when you’re driving without the child in the car) ...also, I don’t like the gray rubber thingies that come on Frontier/Pinnacle straps. Pioneer does NOT have them so that’s a good thing in my opinion.
Clearwater, Florida
Verified Buyer
The last car seat I’ll ever need to buy!
June 28, 2019
I’m 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 it’s 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, it’s 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
Lancaster, OH
Verified Buyer
Britax carseat
June 26, 2019
Love it and my grandson is happy riding in it!
  • It's a bit heavy.
Verified Buyer
Super sturdy, very easy to install and switch cars
June 10, 2019
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.
Suwanee, Georgia
Verified Buyer
Spend the extra $ for click tight
May 28, 2019
Hard to install
  • Difficult to install
Verified Buyer
Perfect toddler transition seat
May 22, 2019
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 husband’s car!
Verified Buyer
May 1, 2019
Great seat. It’s definitely bulkier than other seats available but totally worth it. Kids love the cup holders and little snack/toy holders.
Placerville, CA
Verified Buyer
We own 3
April 24, 2019
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.
Giacomo R.
Verified Buyer
Great and affordable Carseat
April 15, 2019
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!

Los Angeles
Verified Buyer
Great transition booster
April 14, 2019
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.
Pottstown Pennsylvania
Verified Buyer
One minor issue...
April 5, 2019
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.
Denver, CO
Verified Buyer
March 31, 2019
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.
Highland Park, Illinois
Verified Buyer
March 30, 2019
Very happy with the car seat and as always Albee Baby’s very timely delivery.
Diane V.
Colorado Springs
Verified Buyer
Amazing Booster car seat
February 14, 2019
Fantastic car / booster seat!! Definitely worth the purchase!! 5 star product for sure and the grandson is protected yet feels like a big boy!
Verified Buyer
Good price for Britax
January 23, 2019
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....
North Carolina
Verified Buyer
Britax Pioneer is amazing!
January 22, 2019
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!
Ventura, CA
Verified Buyer
Good seat, second time buying it
January 12, 2019
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.
Long Island, NY
Verified Buyer
Love this Booster Car Seat!
November 29, 2018
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.
Verified Buyer
Love this seat
November 24, 2018
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.)
Buena Park, CA
Verified Buyer
Safe and comfortable
November 23, 2018
Great value for safety and comfort. My son loves this carseat.
Verified Buyer
Very comfortable
November 11, 2018
Car seat is very comfortable and easy to use.
Kirkland, WA
Verified Buyer
Unbeatable Safety and Value
October 20, 2018
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
Verified Buyer
Perfect car seat
September 13, 2018
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.
Gabrielle G.
Minneapolis, MN
Verified Buyer
September 13, 2018
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.
Sand springs, ok
Verified Buyer
Best car seat!
September 8, 2018
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 won’t have to buy another seat this one will grow with him. Super easy to install also.
Canton ga
Verified Buyer
It’s better than graco but not as great as clicktight
September 4, 2018
This seat fits our needs but I do not like to move it from car to car. It’s 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. It’s 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
Verified Buyer
Great large carseat
August 31, 2018
Great large car seat. Fits perfectly in our van. Easy install.
Carthage, MO
Verified Buyer
Britax Pioneer
August 31, 2018
This carseat has been perfect for our needs! Prices were awesome! Checkout and shipping were fast and easy!
Wilmington, NC
Verified Buyer
Exceptional safety for its price!
August 29, 2018
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.
Boone, NC
Verified Buyer
Excellent Quality
August 25, 2018
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.
Verified Buyer
Great value and Love Britax
August 24, 2018
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 .
Atlanta, Georgia
Verified Buyer
Grandma is happy!
August 22, 2018
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
Fort Collins, Colorado
Verified Buyer
Britax Pioneer
August 18, 2018
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.
Warsaw, NY
Verified Buyer
Another top quality seat from Britax
August 17, 2018
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.
Verified Buyer
Great seat!
August 17, 2018
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.
Verified Buyer
Love Britax
August 15, 2018
As always Britax surpasses the competition in construction!! Bought this one cause I couldn’t afford two click tights so not as easy to put in but it’ll do:).
Carole I.
Verified Buyer
Great seat
August 15, 2018
Just what I needed for my grandchildren!!!!
Charlotte, NC
Verified Buyer
Love it!
August 2, 2018
We are on Britax car seat #3 (B-safe, marathon, now this). We buy 2 each time so that I have one and my husband has one. Have never had issues. My 4 year old loves his new booster seat. I wanted a booster with the harness for added safety. He’s not yet 40 pounds so we’ll continue using the harness until he’s too big - he’s always had a harness so doesn’t know any different. :) He says it’s very comfortable. It’s super easy to install. We always use the tether. It doesn’t budge. Ordering was easy and shipping was very fast! Highly recommend this site and this booster.
Tara R.
Verified Buyer
Love Britax
July 25, 2018
It’s a very well made, sturdy seat. The only thing I would warn some people of is that the back is really high. I drive an SUV so it’s fine, but in a small car it may be a little high in the back.
Odessa, Florida
Verified Buyer
Very happy!
July 21, 2018
My son is 5 and wanted a “big boy” booster seat but I wasn’t ready to not have him in a harness, this seat works out great!!
Customer Q&A