Why does Britax call this convertible car seat the Marathon 70? Because it will protect your child for a very long time, from birth until 70 lbs.! It's also incredibly durable, comfortable, and loaded with the unique safety technologies synonymous with the Britax name, including: SafeCell Technology - SafeCell within the base of the car seat compress in a crash, lowering the center of gravity, which helps counteract the natural forward motion of the car seat. Integrated steel bars - these strengthen the connection of the car seat to your vehicle and reduce forward flexing of the car seat. Energy-absorbing Versa-Tether(R) - with a 2-point attachment to minimize rotation, the tether releases in stages to slow forward movement upon impact, reducing risk of head injury. Plus, the Marathon... Less

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.

The MARATHON 70-G3 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-G3 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.

Featuring unique safety features, the Britax Marathon 70 Car Seat is as safe as it is convenient.

The BRITAX BOULEVARD 70 CS convertible car seat is designed for children rear facing from 5 to 40 pounds and forward facing from 1 year and 20 pounds up to 70 pounds. The BOULEVARD 70 CS 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 CS also incorporates BRITAX True Side Impact Protection, a Click & Safe Snug Harness Indicator, and HUGS. An easy access cover and access to belt paths from the front of the seat make it easier to install. It is also equipped with a five-point, no-rethread and quick-adjust harness, multiple buckle and recline adjustments, and a body pillow for comfort.

The Roundabout 55 is the most affordable Britax convertible car seat you can buy! This very smart car seat provides the advanced, 360-degree protection you expect from Britax, including: SafeCell Technology - the base of the car seat actually compresses in a crash, lowering its center of gravity and counteracting forward motion. Integrated Steel Bars - these strengthen the connection of the car seat to your vehicle, limiting forward flexing of the car seat. Energy-absorbing Versa Tether(R) - because the tether is released in stages, it slows forward movement upon impact. The two-point attachment minimizes forward rotation, while anchoring the top of the car seat and reducing risk of head injury. Side Impact Protection - the deep side walls are lined with energy-absorbing EPP foam that... Less

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