Help Selecting Seat Foam

[cam198]

I am restoring a antique parlor chair and I was wondering what grade foam I should use for the seat cushion. The seat originally had plant fiber, horse hair, and a cotton pad in it. And the cushion has coil springs underneath it. I am new to all of this so I'd appreciate your patience Thanks in advance!
I attached some pics of the chair

[Prle77]

I would strengthen the frame a bit then use elastic webbing instead of springs... As a cushion I would use HR32-90 foam (about 100mm thick)
That will give you nice comfy bouncy feel and it will last quite a while...
Alen

[Xanthorrhoeas]

IMHO any foam is a waste of your time and effort. They all feel bad and dont last. If you still have it wash the original filling and reuse it for a more authentic and longer lasting seat. They always used to rewas and rstuff the horsehair regularly. It lasts forever, foam does not.

[Blackout]

Now that's going to help me avoid another restoration mistake. After reading your comment I did some reading and found I'll be happy to take the horse hair stuffing and cleaning it for reuse. I'm even thinking I can build some stock from old wrecked furniture (unless I can rebuild it) to use on furniture where people have already thrown it away. Great advice, thank you.