Felled seam

The fold encases the raw edges, which protects them from fraying.

It is useful for keeping seam allowances flat and covering raw edges.

[1] The flat-felled seam is the type of seam used in making denim jeans, although it appears inside-out to reduce stitching.

[clarification needed] A flat-felled seam can be used on various fabrics, not just denim.

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