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Britax Marathon 70 Convertible Car Seat - Waverly

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  • $289.99
  • $149.98
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  • Gift wrap is not available for this item.

  • Product is not available for shipping internationally. (Details)

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Product Description

The Britax Marathon 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 MARATHON 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 MARATHON 70 also incorporates BRITAX Side Impact Protection, offers a no-rethread and quick-adjust five-point harness, multiple buckle and recline adjustments, and an easy access cover and access to belt paths from the front of the seat. A head and body pillow is provided for comfort.


  • 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
  • Side Impact Protection comprised of deep side walls lined with energy-absorbing EPP foam distributes crash forces, shields from vehicle intrusion, and contains 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

Additional Info





21 x 18.5 x 26



23.1 pounds

29.4 x 19.2 x 18.2

How to Get It

  • This item can be shipped to the entire United States including Alaska, Hawaii, and all U.S. territories including Puerto Rico
  • This item can also be shipped to APO/FPO addresses and to P.O. Boxes in all 50 states
  • Due to shipping restrictions, Ship Charges will be separate from other items in your order
  • This item will ship by itself

  • This item may be shipped via Standard Shipping, Expedited Shipping or Express Shipping
  • Please Note: Some addresses are eligible for Standard Shipping only (APO/FPO, P.O. Boxes, U.S. Territories and Puerto Rico)

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  • This item is sold online only (not sold in stores)
  • Orders placed for Store Pickup will receive online pricing and promotions
  • In-stock status is approximate and may not reflect recent sales
  • Not all items are carried at all stores. Please click the "Select a store" link to check product availability

Customer Reviews Summary & Ask a question

Average Customer Rating:

by PowerReviews
Britax Marathon 70 Convertible Car Seat - Waverly

(based on 1 review)

Ratings Distribution

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  • 1 Stars



Reviewed by 1 customer

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(12 of 12 customers found this review helpful)


Great, safe seat


from Los Angeles, CA

About Me First Time Parent


  • Comfortable
  • Easy to Adjust
  • Easy to Clean
  • Easy to install
  • Safe
  • Sturdy
  • Stylish


  • Bulky

Best Uses

  • Infants
  • Toddlers

Comments about Britax Marathon 70 Convertible Car Seat - Waverly:

I bought this seat for my daughter when she was a year old and transitioning out of her infant seat after hearing all the great reviews from many of my fellow mom friends.

This seat is well-constructed and sturdy. The LATCH connectors are easy to use and installation was quick and simple for both rear and forward facing. I was able to get a very tight installation in a few minutes in both our SUV and sedan. It is also fairly big with deep side walls for extra protection. I don't mind the size, but it may be an issue if you need multiple car seats for your back seat.

The headrests and harness are easy to adjust for a growing child and I hope to keep my child in this seat as long as possible. It may not be the last seat you buy, but you will get some years out of it. Although the weight limit is 70lbs, most children will reach the height limit long before the weight limit. My daughter is 36inches tall and is still on one of the lower harness settings. The fabric is nice and my daughter has fallen asleep many times on long car trips.

I have also washed the cover several times. The cover comes off without having to uninstall the seat and is machine washable. Very convenient.

This seat is similar in every way to Boulevard except for the extra padding around the head - same shell, size and adjustment features. The Boulevard boasts the "true side impact protection" vs. the Marathon's simply "side impact protection." Ultimately I decided that the few extra inches of fabric and the extra descriptive word did not justify the added expense.

I can't recommend this seat enough. However, if price is a drawback (which is really I think, the only negative to this seat - its expensive) I encourage you to also look at the Evenflo Triumph 65 or Symphony 65. They have many of the same safety features.

Overall, this is a wonderful seat and I highly recommend it!!

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