Those ones are approved to use with some car seats (it’s the only make that has been crash tested)That carseat blanket thing she shared is sooo dangerous. You're not meant to add extras to carseats including thin blankets like that between the child and the seat itself with the straps. It's not been tested in any carseat safety tests. I bet if I said something to her though she'd cry troll and block me. Just makes me cringe that she's shared that with so many people.. Just put a blanket over the top like normal people do.