Felling Foot (ESG-FF) For Low Shank Baby Lock, Brother & Singer This flat felling foot has a 4mm underfoot groove which is fantastic for making one-step, professional looking flat felled seams and for turning narrow edges and hems. This foot saves time and is great for garment construction, especially enclosed side seams on denim. A flat felled seam stitched with a double needle is the most common stitch for shirts and casual garments, also known as a cover stitch.