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    Britax Marathon Onyx Convertible Car Seat

Britax Marathon Onyx Convertible Car Seat

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Product Description  
Key Features  
Recommended for Ages More than 4 Years
Restraint System 5-Point Safety Harness
Weight Limit 5 - 5 lb.
Head Protection No Headrest
Seat Type Convertible
Height Limit 18 - 49 in.
Seating Direction Rear/Forward Facing
Product Identifiers  
MPN 6DE41F55
Other Features  
Brand Britax
Stay-in Car Base No Detachable Base
Carry Handle No Carry Handle
Additional Features Top Tether Strap
Adjustable Harness Height Adjustable Harness Height
Lowest Price
Consumer Reviews
Britax Marathon Onyx Convertible Car Seat
Britax Marathon Onyx Convertible Car Seat
Not Currently Available

Product Review Summary

Based on 66 user reviews
97% recommend this product
5 stars
4 stars
3 stars
2 stars
1 star
  • Durable (34)
  • Comfortable (32)
  • Safe (32)
  • Easy to Use (31)
  • Great Design (24)
  • Good Value (12)
  • Stable (4)
  • Easy to Clean (2)
  • Sturdy (2)
  • Good Quality (2)
  • Expensive (17)
  • Bulky (8)
  • Heavy (5)
  • none (4)
  • Difficult to Clean (1)
  • fit around legs a little tight (1)
  • outgrown too fast (1)
  • Difficult to adjust (1)
Good For
  • Toddlers (34)
  • Everyday Use (28)
  • Large Cars (26)
  • Infants (24)
  • Travel (18)
  • Small Cars (12)
  • Short Trips (6)
  • Long Trips (6)
  • Boys (1)
  • Preschoolers (1)
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Consumer Reviews


When "Good" just isn't enough...

bylunachan9 Jun 15, 2009
17 Helpfuls 18 Helpfuls Was this review helpful?
Pros Ease of use, safety, comfort
Cons Price, size
Recommended it? Yes

I am infatuated with my son’s Britax car seat.  When I worked at Babies R Us (about 6 years ago) I learned just about everything I could learn about car seats, how they’re made, how seat A stacks up against seat B and the ratings and what you should look for.  You also learn all the quirks that... Read full review »


Makes me feel my toddler is safe!

bymarch972 Jan 23, 2007
17 Helpfuls 18 Helpfuls Was this review helpful?
Pros Safe& Sturdy, Easy to install
Cons Bulky
Recommended it? Yes

On baby # 2 I probably would have kept using the same middle of the road brands that we had used with baby #1, but my son was born with brittle bone disease. So any Unnecessary jarring could cause him to break a bone or 5. So I started to look into what were considered the "best " on the market. My... Read full review »

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