Gym Equipment Foam/Padding?

Im making a pad for a piece of gym equipment that will need to handle heavy loads. It will have a vinyl upholstery covering. I want the padding to be

I'm making a pad for a piece of gym equipment that will need to handle heavy loads. It will have a vinyl upholstery covering. I want the padding to be 3'' thick and very very firm. Should I go with a high ILD foam (70-90) or layer carpet padding? Which is firmer?

THANKS!

or:I'm making a pad for a piece of gym equipment that will need to handle heavy loads. It will have a vinyl upholstery covering. I want the padding to be 3'' thick and very very firm. Should I go with a high ILD foam (70-90) or layer carpet padding? Which is firmer?THANKS!

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