Mattress

FIG. 1 is a perspective view of a mattress showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an enlarged view of portion 8 shown in FIG. 1 .

The dash-dash broken lines in the drawings depict portions of the mattress that form no part of the claimed design.

The dot-dash broken lines represent boundaries of the enlarged portions and form no part of the claimed design.