Seat padding

[olepaw]

I don't like being burnt ,so my seat is just aluminum . I often bruise  , but better than blisters

[ronnieroadster]

Wayno I agree with you the rule book offers up minimums. You shouldn't be shy about going beyond.   
What do you think about the following?

HIGH RESILIENT (HR) is a foam material that is produced to offer a longer useful life than non-HR foam. HR foam is often also rated as fire resistant (FR). Tell your Upholsterer that you are concerned about fire safety and long life of your new foam and ask him to verify that your new foam is rated both HR and FR. Most States have Furniture Flamibility Laws that will require the use HR-FR foam materials.
  Some foams contain Fire retardant additives I also found theres fire retardant classifications for the various types of foams. The denser foams like the HR seem to have the FR clasification and the added benifit of a longer life span for deteriation. 

[Peter Jack]

There's a reason that helmet liners are made from non resilient (NR) foam. Resilient foam transfers the force of a blow with very little dissipation of the force. Seat liners are made with non resilient materials. Just something to think about.

Pete

[dw230]

Peter Jack's post is the reason that the padding was set to 1" max. thickness. Thanks to the inputs I have added fire resistant padding to my list of 2016 rule proposals.

DW

[Dr Goggles]

Better question -

Why would you want to run with flammable foam under your arse?

Love yer spellin'...

If you've ever had a broken coccyx you'll feel every one of those five miles....

[tauruck]

I suppose I'm dealing with a bunch of non ex kart racers.