How narrow is the Foonf supposed to be?



13" at the base, and 17" at the widest point. I think the Radian is about 17" at the widest point as well.

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The Radian is narrower for the most part. The width of The Foonf is just 13 inches wide at the base, but within a a few inches it flares out to 17 inches where the child sits. The Radian is just 14 inches wide where the child sits and then flares up to 17 inches closer to the top. When RF, the Foonf sits pretty high up on the base though, so it might work better depending on what seats you're trying to puzzle together.

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