Part of your problem is the UVmap of the model - it looks like you've scaled a box down to make it flatter, so the "foam" is coming out in long streaks instead of 1:1 proportions shown in the material editor.  It's also probably too rough and the bump strength is very likely too high - what is your default unit, feet? inches?  0.35 is very high even for inches or centimeters, for something like a foam mattress.

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