FIG. 1 is a perspective view of a floor underlayment showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a right elevation view thereof, which is identical to the left elevation view, the front elevation view, and the back elevation view; and,
FIG. 4 is a bottom plan view thereof.
The broken lines show portions of the floor underlayment which form no part of the claimed design.
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