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Redline refers to a colored warp thread that is run through the selvage edge of denim fabric. This is not indication of the quality of the jeans so much as it is a signature of the maker, and a way for Cone Mills (textile manufacturer) to differentiate between the denim they made for different companies. Lee denim had a green (or sometimes blue) warp thread on their selvage, and Wrangler used yellow.

Redline was also the signature line by Levi that contained the “Big E“, but were all produced before 1971.

In the picture below you can see the redline running up the selvage edge:

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