The ornamental design for a chair with doublecontouredbottom, as shown and described.
FIG. 1 is a front view of a chair with double contoured bottom showing my new design;
FIG. 2 is a back view thereof;
FIG. 3 is a side view (opposite side view is mirror image) thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a front cross-sectional view taken through line 6-6 of FIG. 4; and,
FIG. 7 is a side cross-sectional view taken through line 7-7 of FIG. 4.
In FIG. 1, the broken lines showing of environmental structure for purposes of illustrating the chair with double contoured bottom in a condition of use. The broken lines and the structure they depict form no part of the claimed design.