FOAM: SEAT MAX
CHOOSE YOUR FIRMNESS
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CHOOSE YOUR FIRMNESS.
SOFT (22 lb IFD)
MEDIUM (35 LB IFD)
FIRM (45 LB IFD)
What is IFD?
IFD is the measure of firmness in foam. It stands for Indentation Force Deflection and it is the measure of how many pounds of pressure it takes to compress a given sample of the material to 75% of it's original height. One thing that is important to note is that firmness is NOT the same thing as foam density, nor does it relate to the quality of durability of the material. Firmness simply describes the properties of the foam, while density is ultimately the measure of quality/durability.
How Should I Choose a Firmness Level?
Firmness is purely a matter of preference and, to keep things simple, we offer three straightforward options that tailor to whatever your preference might be. If you prefer a softer seating surface, the "SOFT" option is likely for you. If you prefer a cushion that is firmer, "FIRM" would be the way to go. For everyone in between, the "MEDIUM" option provides a perfect middle-of-the-road.
Why doesn't Seat Ultra have a soft option?
This is simply because the level of density in this material doesn't allow for softer IFD's. It is very long lasting, however, and comes in Medium, Firm, and Extra Firm varieties.