Lap Seam Folder Folds both edges of fabric in opposite directions to sew raw edges inside each other. Ideal for heavy or rough fabrics (denim or canvas) Back to overview Item Number B0-75001 Compatible Machines Aspire | Gloria | Ovation | Euphoria | Primo Category Devices The Lap Seam Folder, folds the fabric edges in opposite directions so that both cut edges end up inside the fabric. This joint is used for heavy, coarse fabrics such as jeans or canvas.