Simplicity 5552; ©1973; Slipcover For Twin Bed, Studio Couch Or Day Bed With Round Or Wedge Style Bolster: This envelope contains patterns pieces and detailed directions for making a slipcover with a wedge style or round bolster. This type slipcover comes in several different widths and lengths. In this pattern we've covered 30", 34", 36", 39" widths, and 72", 75", 78" lengths. The slipcover fits any combination of these lengths and widths up to 20" high. Round bolsters measure 9" x 36". Wedge bolsters measure 5" x 9" x 12" high x 36" long