The ornamental design for an airmattress, as shown and described.
FIG. 1 is a top plan view of an air mattress showing my new design, the
bottom being a mirror image of that shown, and the pattern of elements
being understood to repeat uniformly across the surface represented;
FIG. 2 is an end elevational view thereof, the opposite end being a mirror
image of that shown;
FIG. 3 is a side elevational view thereof, the opposite side being a mirror
image of that shown; and,
FIG. 4 is an enlarged fragmentary top plan view of one corner thereof, the
pattern of elements being understood to repeat uniformly across the
surface represented.