Mass has a quality, a feel. The lighter seats will save fuel, save manufacturing costs. But will they feel flimsy as you sit down in them? Will the seat back flex more? Will the seat require replacement after a crash because the thread inserts pulled out?
Beth: I thought the exact same thing about the toddler car seat. I'd really like to see a photo of it in the car itself to get a better perspective. How stable is it? Seems a car seat that conforms to your body (much like a foam mattress) may not be the best choice in terms of keeping drivers alert.
The weight saving aspect has to have appeal, especially for manufacturers building the super small, lightweight cars we're starting to see so hit the road. Kind of a funky look to the design, however. To me, it looks like a cross between a giant toddler car seat and some of those ergonomic office chairs that are popular today.
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