FIG. 1 is an upper perspective view of an air mattress showing my new design in a first position.

FIG. 2 is a right side view of an air mattress showing my new design in a first position.

FIG. 3 is a left side view of an air mattress showing my new design in a first position.

FIG. 4 is a top view of an air mattress showing my new design in a first position.

FIG. 5 is a bottom view of an air mattress showing my new design in a first position.

FIG. 6 is a front end view of an air mattress showing my new design in a first position.

FIG. 7 is a rear end view of an air mattress showing my new design in a first position.

FIG. 8 is an upper perspective view of an air mattress showing my new design in a second position.

FIG. 9 is a right side view of an air mattress showing my new design in a second position.

FIG. 10 is a left side view of an air mattress showing my new design in a second position.

FIG. 11 is a top view of an air mattress showing my new design in a second position.

FIG. 12 is a bottom view of an air mattress showing my new design in a second position.

FIG. 13 is a rear end view of an air mattress showing my new design in a second position.

FIG. 14 is a front end view of an air mattress showing my new design in a second position.

FIG. 15 is an upper perspective view of an air mattress showing my new design in a third position.

FIG. 16 is a right side view of an air mattress showing my new design in a third position.

FIG. 17 is a left side view of an air mattress showing my new design in a third position.

FIG. 18 is a top view of an air mattress showing my new design in a third position.

FIG. 19 is a bottom view of an air mattress showing my new design in a third position.

FIG. 20 is a front end view of an air mattress showing my new design in a third position.

FIG. 21 is a rear end view of an air mattress showing my new design in a third position.

FIG. 22 is an upper perspective view of an air mattress showing my new design in a fourth position.

FIG. 23 is a right side view of an air mattress showing my new design in a fourth position.

FIG. 24 is a left side view of an air mattress showing my new design in a fourth position.

FIG. 25 is a top view of an air mattress showing my new design in a fourth position.

FIG. 26 is a bottom view of an air mattress showing my new design in a fourth position.

FIG. 27 is a front end view of an air mattress showing my new design in a fourth position; and,

FIG. 28 is a rear end view of an air mattress showing my new design in a fourth position.

Any shading and cross-hatching are not features of the design but are utilized to illustrate the surface contours of the air mattress in the drawings.