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.