Flatlock stitching is a wetsuit stitching technique used mainly on warm water summer wetsuits, such a shorties or other wetsuits under 2.5mm thickness. A flatlock seam is not glued and not waterproof. During manufacturing the sewing machine needle penetrates both overlapping neoprene panels at the seam to create the most affordable seam construction used in wetsuits. Flatlock stitching cannot be used in winter wetsuits, as it lets water through and won’t protect against cold.
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