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Britax Marathon 70-G3 Review. Packed with comfort and safety features, the BRITAX MARATHON 70-G3 Convertible Car Seat is designed with 360-degree protection to keep your child secure in the event of a crash. It offers high-density comfort foam for extra support, a cushiony cover, and an EZ-Buckle system for convenience when harnessing your child. The MARATHON 70-G3 accommodates children rear facing from 5 to 40 pounds and forward facing from 20 to 70 pounds.