5 point harness for over 18kg

[excitedmuchly]

Hello. Anyone got a car seat with a 5 point harness suitable for over 18kg? Really struggling to find any that dont use the normal seat belt. I just don't feel right using a normal seat belt for a 4 yr old
I've found the cosy and safe excalibur or the joie bold. Need it to be isofix as well!
Thanks in advance!

I don't think that its any safer using a 5 point harness after 18kg in most circumstances. If you rear face there are a few more options but not isofix. Isofix is only safe for a certain weight so very few (I think 2) have limits higher than 18kg

You also need a top-tether for a ff harnessed to 25kg seat. I think most newer cars have them.

I've got a top thingie so all good on that front!

I think that the diono radian 5 is harnessed to 25kg but I don't think its isofix. Why does it need to be isofix?

csftl.org/european-car-seats-25-kg-weight-limit-seats/

You won't get an isofix only one, because isofix only supports a child weiht of around 18kg (it's a bit higher, but not much).

What you may find is isofit, which means that the seat uses the isofix points to keep it in place, but then it uses tether straps and/or the car's seatbelt to secure the seat in place in the event of a crash.