Britax Poplar S Convertible Car Seat
Ready to go with room to grow! The Poplar S convertible car seat takes the stress out of moving to the next car seat stage thanks to the patented ClickTight installation and slim SpaceSaver design. This convertible car seat accommodates up to 50 lbs when installed rear-facing and easily switches to a forward-facing car seat as your child grows. ClickTight technology provides fully open seat belt paths that are clearly labeled and easy to access, and the automatic tensioner takes care of the tightening. This baby car seat lets you easily adjust the 14-position no-rethread harness and headrest to help create the perfect fit. The removable infant insert helps to properly position infants 22 lbs and under, while 2 additional premium inserts enhance comfort and provide a tailored fit.
Harness Type
5-Point Safety Harness
Safety Features
Carbon steel frame, ReboundReduce Stability Bar
Max Height Capacity
49 Inches
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Top answer
• 2 votes
For reference-- the highest harness slot for each car seat is as follows-- Boulevard 19.5" Poplar S 18" Extend2fit (2 in 1 and 3 in 1) 17.5" They all have a 49" height max and follow the 1" rule. Kids can outgrow the car seats by height and/or by torso height, which is why the 1" rule applies and straps have to be coming from the correct spot. (At or below with RF and at or above with FF).
2 votes
The Graco has an extending headrest as well, and goes taller rear facing. I’ve never heard of a child outgrowing it by height rear facing. In fact, I’ve seen pictures of teens and small adults (all obviously over the weight limit) fitting in the tall Gracos with an inch over their head. If height is what you want, the Graco wins. The Poplar is shorter. The Poplar has 17” top harness height (the Boulevard ClickTight had 18.5”) and the Graco has 17.5”. They’re both compact. They’re both easy to install. The ClickTight is easiest, of course, but if you have ever installed a non ClickTight seat you can easily install the Extend2Fit.
Big-headed kids with 99% heads may find they have less than 1'' above their head before the Poplar is outgrown otherwise.
I prefer the material quality and features of the Britax but I have big doubts about its ability to fit taller children rear-facing.
The Poplar headrest is a bit shorter than the Graco, which has me asking a whole new question about head size/percentile.
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