I claim the ornamental design for a sheet for vehicle seats, as shown and described.
FIG. 1 is a surface view of a sheet for vehicle seats according to the design claimed.
FIG. 2 is a reference view of FIG. 1, with dot dash broken lines being shown therein to identify the area 3 which circumscribes the location from which FIG. 3 is taken; and,
FIG. 3 is an enlarged detail view of area 3 surrounded by dot dash lines on FIG. 2.
The evenly spaced broken line perimeter represents the boundaries of the claim and forms no part thereof. The lead line in FIG. 2 and the dot dash lines in FIGS. 2 and 3 represent the unclaimed boundary of the detail. The thickness and the rear of the sheet for vehicle seats form no part of the claimed design.