DD has these on her Radian for side protection but someone got us a Radian for the new baby due in May and it does not have those. How much do they matter?
Young born-again mama and loving wife to DH and SAHP to two crazy girls we and believe !
Short answer: we don't know. There's no evidence proving that they matter at all. We know that the safest thing to do is to rear-face to the limits of the seat, and that rear-facing provides substantial side impact protection in any seat.
Carseat-checking (CPST) and WAH mama to a thirteen-year-old girl.