The ornamental design for a flexiblebelt, as shown and described.
FIG. 1 is a top-front-left perspective view of a flexible belt showing my new design;
FIG. 2 is a bottom-rear-right perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a right side elevational view thereof;
FIG. 8 is a left side elevational view thereof; and,
FIG. 9 is a cross sectional view taken along line 9-9 in FIG. 2.
The broken lines showing of chain connections in FIGS. 1-2, 5-6, and 9 are included for the purpose of showing environmental structure and form no part of the claimed design.