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  • Britax Boulevard 70 Convertible Car Seat, Onyx
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Britax Boulevard 70 Convertible Car Seat, Onyx

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  • Safecell technology features safecells designed to compress in a crash, significantly lowering the center of gravity and counteracting the forward rotation of the child seat which normally propels the child toward the front seat
  • Integrated steel bars strengthen the connection to the vehicle and reduce forward flexing of the child seat during a crash
  • Energy-absorbing versa-tether features a staged-release tether webbing to slow the forward movement, reducing the crash forces reaching the child, and a two-point attachment to minimize forward-rotation while anchoring the top of the child seat
  • True side impact protection offers an extra layer of EPP foam, keeping the head, neck and spine aligned, and deep side walls lined with EPP foam to distribute crash forces, shield from vehicle intrusion, and contain the head, neck and body
  • Tangle-Free, Five-Point Harness distributes crash forces across the strongest parts of the body and provides a secure fit
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Product Information

Color: Onyx
Technical Details
Product Dimensions21 x 18.5 x 26 inches
Item model numberE9BB51A
Minimum weight recommendation5 Pounds
Maximum weight recommendation70 Pounds
Batteries requiredNo
Additional Information
Best Sellers Rank #47,126 in Baby (See top 100)
Shipping Weight22.7 pounds
ShippingCurrently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
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Product Description

Color: Onyx

Product Description

The Britax Boulevard 70 convertible car seat is designed for children rear facing from 5 to 40 pounds and forward facing from 1 year and 20 lbs up to 70 pounds. The Boulevard 70 achieves revolutionary head safety through the use of Britax SafeCell Technology, integrated steel bars, and versa-tether that work together to minimize head excursion and reduce the risk of head injury during a frontal impact. The Boulevard 70 also incorporates Britax True Side Impact Protection and offers a five-point, no-rethread and quick-adjust harness, multiple buckle and recline adjustments, and an easy access cover and access to belt paths from the front of the seat. A body pillow is also provided for comfort and infant positioning.


The BRITAX BOULEVARD 70 Convertible Car Seat achieves optimum head safety through the combination of BRITAX SafeCell Technology, integrated steel bars, and a Versa-Tether, which work together to minimize head excursion and reduce the risk of head injury during a frontal impact. It also features easy installation, True Side Impact Protection, and innovative details for your child's comfort and safety. The seat fits children in the rear-facing position from 5 to 40 pounds, and children in the forward-facing position starting at one year old and 20 pounds, up to 70 pounds.

callout box top

Convertible Car Seat

At a Glance:
  • Age/Weight Requirements: In rear-
    facing position, fits children weighing 5 - 40 pounds; in forward-facing position, fits children 1+ years old weighing 20 - 70 pounds

  • Warranty: 1-year
    limited warranty

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Britax Boulevard 70 Convertible Car Seat

Available in (from left to right):
Cowmooflage, Onyx, Paisley, and Riviera.
Britax Boulevard 70 Convertible Car Seat
Safety features include SafeCell Technology and True Side Impact Protection.
View larger.
Britax Boulevard 70 Convertible Car Seat
Comfort features include dual recline positions and high-density comfort foam.
(Shown here in Paisley.) View larger.
BRITAX 360 Degree Protection
The BRITAX BOULEVARD 70 features technologies that work to minimize injury to your child during a crash from any direction, including both frontal and side impact crashes - the most frequent types of crashes. These technologies work together with other features on the car seat to minimize injury to your child during a crash by:

  • keeping your child in the vehicle,
  • diverting crash forces away from your child,
  • helping to slow down your child's body,
  • minimizing movement of your child, and
  • protecting your child's brain and spinal cord.
SafeCell Technology for Advanced Head Safety
Designed with SafeCell Technology, the BOULEVARD 70 features SafeCells, which are engineered structures located in the base of the seat designed to compress in the event of a crash. This compression significantly lowers the center of gravity and counteracts the forward rotation of the car seat, delivering unprecedented performance in a crash.

The BOULEVARD 70 also features integrated steel bars, which strengthen the connection to the vehicle and reduce the forward flexing of the car seat. In addition, the energy-absorbing Versa-Tether anchors the top of the car seat and minimizes forward rotation of the car seat to reduce the crash forces that can reach your child if an accident occurs. These three features work together as a system to provide revolutionary head safety protection for your child.

True Side Impact Protection for Advanced Security
Offering True Side Impact Protection, the BOULEVARD 70 delivers advanced protection if you happen to face an unexpected side-impact crash. True Side Impact Protection is a system composed of a rigid seat shell with deep side walls, an adjustable head restraint, and an extra layer of energy-absorbing EPP (Expanded Polypropylene) foam lining the head restraint. These combined features work together to protect your child's head and chest from incoming side-impact crash forces by distributing the forces over a larger surface area, helping shield your child from vehicle intrusion, contain your child's head and body in the seat, and minimize side-to-side movement of your child's head.

Premium Fit and Comfort Features
Whether children are watching the world go by or snuggling in for a nap, they'll enjoy that the BOULEVARD 70 reclines in both the forward and rear positions. And thanks to additional features, which include high-density comfort foam and a plush cover set with matching belly pad, they'll always ride in style and comfort. A 70-pound weight capacity, two buckle positions, and a tangle-free five-point harness with ten harness height settings provide a snug, custom fit for your growing child. Plus, an optional Infant Positioning Insert (sold separately) allows you to properly and securely fit smaller infants into the car seat.

Ease-of-Use for Safety and Convenience
Packed with perks for parents, the BOULEVARD 70 makes it easy to secure your child in the proper position without guesswork. Premium lower LATCH connectors make for a quick, simple, and tight installation, while the push-button allows you to easily uninstall the connectors. Easy-to-access built-in lock-offs allow you to install the car seat with ease using your vehicle's lap and shoulder belt. The quick-adjust harness system and buckle allow you to reposition the harness height without disassembling the harness straps.

Additionally, an anti-slip contoured base grips and protects the vehicle seat, ensuring a tight installation in all types of vehicles. Convenient holders keep harness straps out of the way when you're placing your child in the seat, and the plush cover set with matching pads removes easily for cleaning without requiring you to disassemble or uninstall the car seat.

The BRITAX BOULEVARD 70 Convertible Car Seat is backed by a one-year limited warranty.

What's in the Box
One BRITAX BOULEVARD 70 Convertible Car Seat and manual.

Customer Reviews

I highly recommend this car seat.
Austin Matthews
It fits perfect in the car front and rear facing.
I feel very safe with him in this seat!

Most Helpful Customer Reviews

211 of 215 people found the following review helpful By RaxterRiley on November 12, 2011
Color Name: Cowmooflage
We were involved in a highway accident. Something happened to the tire, I lost control of the car at 70 MPH, we did a 180 and slammed into the concrete barrier (on the rear side, where my kids were). I have three kids, my two daughters were on the side that got hit. My 22 month old daughter is in this carseat, and my 3-year-old in the older model boulevard. They walked away without a scratch. My almost two-year-old slept through the whole thing! She only woke up because my 3-year-old was crying (because she was scared, not hurt). My sister and I were in the front seat and we are okay, but very sore, whip lash, etc. I'm amazed that my children aren't even talking about the accident, and they aren't even the slightest bit sore, even though they were a lot closer to the place of impact! My husband and I don't have much money, but car seats were something that we weren't going to skimp on. Now I am so thankful that we did. We will definitely stick with Britax forever.
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51 of 55 people found the following review helpful By CarseatCrazyMom on November 27, 2011
Color Name: Zebra Verified Purchase
We have only had the seat for a week so I will update my review after a few months but I must say:

1. I LOVE the ease of installation on this seat. I have LATCH and installed Rear-Facing in my 2006 Acura TL, rear passenger side on the full recline setting (required for rear-facing mode) and it was perfect. No towel or pool noodle needed like our Recaro ProRide. Its perfectly level with the ground and at a perfect angle for my 11 month old to ride comfortably. The latch belts are attached to the metal bars on the sides of the seat so you just slide it to the front of the seat for RF position! No rerouting or removing covers or anything like that! How simple, I was literally amazed at how easy they designed this. It took me 3 times longer to read the whole manual (ALWAYS read the whole manual first) than it did to adjust the strap position and install it.

2. My daughter rarely fell asleep in the car anymore because she was so busy looking out the windows and talking to herself in her mirror but in this seat every ride so far, short or long, she has fallen asleep within the first 5 minutes! It must be that comfortable!

3. The fabric does not get hot at all! We live in FL and even though it's November, it is still 80-something degrees in the afternoon and I have a black car with black interior and this seat felt nice and cool even when the rest of the car was burning hot.

4. The velcro strap holders are AWESOME! They hold the straps off to the sides so no more fishing for the buckles under your wiggling baby while you're putting them in their seat!

5. The material in the picture online (in my opinion) makes it look like a smooth meshy almost wind-breakery material... It is NOT like that at all! It almost feels like denim!
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33 of 37 people found the following review helpful By Katherine Prather on February 1, 2012
Color Name: Onyx
I have two different car seats - one for each car - and I'm comparing the Britax Boulevard 70 with the Evenflo Momentum, and I like the Momentum much better. Of course ALL car seats (not just the pricey ones) meet stringent safety requirements and undergo the same government testing, so reviews that suggest some are safer than others are basically just guessing.

What I like about the Britax:
- nice looking fabric
- steel frame
- relatively slim size
- easy to adjust height of straps (but not as easy as the Momentum)
- easy front facing belt or latch installation (but latch system on Momentum is much better)

What I don't like about the Britax:
-straps tangle easily
-not a very cushy seat/padding
-difficult to install rear facing
-cover slides off the top and has to be pulled back on every so often
These are small flaws. It's a great seat. BUT - these flaws make the extra cost seem like too much - a seat this expensive should not have these problems, in my opinion.

What I like better about the Momentum:
-very cushy seat - lots of side padding. My son loves it.
-easy straps, they don't tangle or get stuck in the fabric
-easy to adjust height of shoulder straps
-ratcheting system on latch - no threading the strap through - it took me about 10 seconds to get this seat out of my car and into grandma's
-super soft fabric cover that is a cinch to remove if washing becomes necessary
-good recline in rear facing mode (easy to get it level)

Problem with the Momentum:
-this thing is huge (side to side especially).
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26 of 30 people found the following review helpful By zoey113 on December 23, 2011
Color Name: Onyx Verified Purchase
I had a very large 6 month old who was about to outgrow her infant carrier so I needed a convertible car seat pretty early on. Did a lot of research and even bought a graco signature which was so big we couldn't get it comfortably in the back of my Honda CR-V. Britax got high ratings for safety so we got this one and I'm very happy with it. It is safe and comfortable and fits very well in the car (we have it placed in the center). Found it $100 cheaper on Amazon than the other stores. Might purchase another for our other car. We've only used it in rear facing position so far but it's been great. Easy to install and easy to get the baby in and out.
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Most Recent Customer Reviews