Britax Marathon 70 Convertible Car Seat

Britax Marathon 70 Convertible Car Seat (Previous Version), Onyx
List Price: $289.99
Sale Price: $319.99
Overall Rating: based on 301 reviews
Usually ships in 1-2 business days

Britax Marathon 70 Convertible Car Seat Description

Modest in features, the Marathon 70 is the most basic model of the Britax line of high capacity convertible car seats. With a rear-facing weight capacity from 5-40 lbs, and a forward-facing weight limit of 70 lbs, your child can remain in a 5-point safety harness from infancy through their toddler years. The Marathon 70 features trusted Britax safety through the use of SafeCell™ Technology, Side Impact Protection, Integrated Steel Bars, and more.

Standout Features:


  • Lower center of gravity to increase stability and minimize impact in the event of a crash
  • Side Impact Protection with EPP energy-absorbing foam
  • Quick-adjust, no re-thread harness and two-position adjustable crotch strap
  • Innovative safety features including SafeCell Technology and Integrated Steel Bars
  • Accommodates children up to 40 lbs rear-facing and 70 lbs forward-facing

Benefits for You: Parents will love the quick-adjust harness of the Marathon 70. Adjust the harness shoulder height to accommodate your growing tot without having to re-thread the harness or uninstall then reinstall the seat. The crotch strap is also adjustable to give your little one the most comfortable fit. The contoured base features an anti-slip grip to protect the vehicle seat from the wear and tear that can occur over time.

For your convenience, the Marathon 70 features harness holders to keep the harness straps out of the way while placing your child in the seat. With a front harness adjuster, you can easily tighten or loosen the harness system to achieve the proper fit for your child. Keep the plush fabrics of your Marathon 70 looking good as new with the easy-to-remove, washable cover.

Installation: Install the Marathon 70 rear-facing from 5-40 lbs, and forward-facing from at least 1-year-old and 20 lbs, up to 70 lbs. The Marathon 70 can be installed using either your vehicle’s seat belts or LATCH. The contoured base with anti-slip grip offers optimum vehicle fit, and the rear- and forward-facing recline creates the proper angle for a perfect fit in all types of vehicle seats.


The Marathon’s LATCH system provides a quick, simple and tight installation, and the premium lower LATCH connectors feature a push button for easy release. For added stability, use the top tether to anchor your seat in both the rear- and forward-facing positions. If you install the Marathon 70 using LATCH, you’ll be happy to know you won’t have to re-thread the LATCH connectors through the car seat when you move it from rear-facing to forward-facing.

The guided belt path allows you to easily route your vehicle’s seat belt through the Marathon 70. The belt path is positioned at the front of the Britax seat back, and is easily accessible through the seat fabric. The built-in lock-offs ensure a snug and secure lap and shoulder belt installation with minimal effort. 

Benefits for Baby: Whether infant or toddler, your child will experience extreme comfort and protection in the Britax Marathon 70. Lined with high density comfort foam and covered with plush fabrics, the extra layer of padding and soft outer material will keep your little one cushioned. For smaller infants, Britax offers an Infant Positioning Insert, sold separately, to achieve the most snug fit possible of the harness. 

The 5-point no re-thread harness makes adjusting the height of the shoulder harness effortless, and the two-position crotch strap also easily adjusts for growing children. The Marathon 70 is designed to accommodate children from 5-40 lbs rear-facing, and children at least 1-year-old and 20 lbs, up to 70 lbs forward-facing. Add the Britax Child Cup Holder, sold separately, to your Marathon 70 so your little one can keep drinks close at hand.

Safety:

  • SafeCell™ Technology is a honeycomb-like component inside the base of the seat designed to compress upon impact reducing the forward motion of the child seat, therefore reducing the risk of head and neck injuries

  • Integrated Steel Bars strengthen the connection to the vehicle and reduce forward flexing of the child seat during a crash
  • Patented, 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
  • Harness Ultra Guard System (HUGS™) provides resistance to forward movement in the event of a crash
  • 5-point harness
  • Meets or exceeds FMVSS 213

Comparison: The next step up in high capacity Britax convertible car seats is the Boulevard 70. Although the Boulevard 70 has a higher price tag, the only main difference between the two seats is in the Side Impact Protection. The Boulevard 70 features True Side Impact Protection, a more advanced level of Side Impact Protection (featured in the Marathon 70) that includes an extra layer of EPP energy-absorbing foam, noticeable in the head restraint area.


Another comparable convertible car seat is the RECARO ProRIDE. The ProRIDE is part of RECARO’s ProSERIES collection of child safety seats, designed with Side Impact Protection to protect the five main vulnerable areas of a child’s body – the head, neck, face, torso and pelvis. The ProRIDE uses EPS energy-absorbing foam, as opposed to the EPP foam in the Marathon 70, has a 35 lb weight limit in the rear-facing position and is about 2 lbs heavier, but it does feature an adjustable head restraint. 

For those with backseat space in mind, check out the Sunshine Kids Radian 80SL. At 17-inches wide, the Radian 80SL convertible car seat is more narrow than the Marathon 70, and can fit up to 3 seats across the backseat of most vehicles. The Sunshine Kids car seat features side impact protection and has higher weight capacities at 45 lbs rear-facing and 80 lbs forward-facing. However, the Radian 80SL is taller and heavier than the Britax Marathon 70.

Britax Marathon 70 Convertible Car Seat Details

  • The Britax Marathon 70 convertible car seat is designed for children rear facing from 5 to 40 pounds and forward facing up to 70 pounds
  • 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 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
  • 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
  • Quick-adjust harness repositions the harness shoulder height without disassembling the harness straps

Video Reviews

Britax Marathon 70 Convertible Carseat Review
Britax Marathon 70 Car Seat
Britax Marathon 70 Convertible Car Seat
Britax Marathon 70 Convertible Car Seat (Previous Version), Onyx


4.5
out of
5


based on
301 ratings.
375 user reviews

Britax Convertible Car Seats Featured
Britax Marathon 70 Convertible Car Seat (Previous Version), Onyx

Modest in features, the Marathon 70 is the most basic model of the Britax line of high capacity convertible car seats. With a rear-facing weight capacity from 5-40 lbs, and a forward-facing weight limit of 70 lbs, your child can remain in a 5-point safety harness from infancy through their toddler years. The Marathon 70 features trusted Britax safety through the use of SafeCell™ Technology, Side Impact Protection, Integrated Steel Bars, and more.

Standout Features:


  • Lower center of gravity to increase stability and minimize impact in the event of a crash
  • Side Impact Protection with EPP energy-absorbing foam
  • Quick-adjust, no re-thread harness and two-position adjustable crotch strap
  • Innovative safety features including SafeCell Technology and Integrated Steel Bars
  • Accommodates children up to 40 lbs rear-facing and 70 lbs forward-facing

Benefits for You: Parents will love the quick-adjust harness of the Marathon 70. Adjust the harness shoulder height to accommodate your growing tot without having to re-thread the harness or uninstall then reinstall the seat. The crotch strap is also adjustable to give your little one the most comfortable fit. The contoured base features an anti-slip grip to protect the vehicle seat from the wear and tear that can occur over time.

For your convenience, the Marathon 70 features harness holders to keep the harness straps out of the way while placing your child in the seat. With a front harness adjuster, you can easily tighten or loosen the harness system to achieve the proper fit for your child. Keep the plush fabrics of your Marathon 70 looking good as new with the easy-to-remove, washable cover.

Installation: Install the Marathon 70 rear-facing from 5-40 lbs, and forward-facing from at least 1-year-old and 20 lbs, up to 70 lbs. The Marathon 70 can be installed using either your vehicle’s seat belts or LATCH. The contoured base with anti-slip grip offers optimum vehicle fit, and the rear- and forward-facing recline creates the proper angle for a perfect fit in all types of vehicle seats.


The Marathon’s LATCH system provides a quick, simple and tight installation, and the premium lower LATCH connectors feature a push button for easy release. For added stability, use the top tether to anchor your seat in both the rear- and forward-facing positions. If you install the Marathon 70 using LATCH, you’ll be happy to know you won’t have to re-thread the LATCH connectors through the car seat when you move it from rear-facing to forward-facing.

The guided belt path allows you to easily route your vehicle’s seat belt through the Marathon 70. The belt path is positioned at the front of the Britax seat back, and is easily accessible through the seat fabric. The built-in lock-offs ensure a snug and secure lap and shoulder belt installation with minimal effort. 

Benefits for Baby: Whether infant or toddler, your child will experience extreme comfort and protection in the Britax Marathon 70. Lined with high density comfort foam and covered with plush fabrics, the extra layer of padding and soft outer material will keep your little one cushioned. For smaller infants, Britax offers an Infant Positioning Insert, sold separately, to achieve the most snug fit possible of the harness. 

The 5-point no re-thread harness makes adjusting the height of the shoulder harness effortless, and the two-position crotch strap also easily adjusts for growing children. The Marathon 70 is designed to accommodate children from 5-40 lbs rear-facing, and children at least 1-year-old and 20 lbs, up to 70 lbs forward-facing. Add the Britax Child Cup Holder, sold separately, to your Marathon 70 so your little one can keep drinks close at hand.

Safety:

  • SafeCell™ Technology is a honeycomb-like component inside the base of the seat designed to compress upon impact reducing the forward motion of the child seat, therefore reducing the risk of head and neck injuries

  • Integrated Steel Bars strengthen the connection to the vehicle and reduce forward flexing of the child seat during a crash
  • Patented, 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
  • Harness Ultra Guard System (HUGS™) provides resistance to forward movement in the event of a crash
  • 5-point harness
  • Meets or exceeds FMVSS 213

Comparison: The next step up in high capacity Britax convertible car seats is the Boulevard 70. Although the Boulevard 70 has a higher price tag, the only main difference between the two seats is in the Side Impact Protection. The Boulevard 70 features True Side Impact Protection, a more advanced level of Side Impact Protection (featured in the Marathon 70) that includes an extra layer of EPP energy-absorbing foam, noticeable in the head restraint area.


Another comparable convertible car seat is the RECARO ProRIDE. The ProRIDE is part of RECARO’s ProSERIES collection of child safety seats, designed with Side Impact Protection to protect the five main vulnerable areas of a child’s body – the head, neck, face, torso and pelvis. The ProRIDE uses EPS energy-absorbing foam, as opposed to the EPP foam in the Marathon 70, has a 35 lb weight limit in the rear-facing position and is about 2 lbs heavier, but it does feature an adjustable head restraint. 

For those with backseat space in mind, check out the Sunshine Kids Radian 80SL. At 17-inches wide, the Radian 80SL convertible car seat is more narrow than the Marathon 70, and can fit up to 3 seats across the backseat of most vehicles. The Sunshine Kids car seat features side impact protection and has higher weight capacities at 45 lbs rear-facing and 80 lbs forward-facing. However, the Radian 80SL is taller and heavier than the Britax Marathon 70.



$319.99
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