The word selvedge comes from ”self-edge”. The edge of the denim has a clean finish.
A pair of jeans made from selvedge denim can easily be identified simply by looking at the inside of the outseam.
There are variant spelling of the term; Selvedge or selvage both are grammatically correct. The brand prefers
using the former in its product titles and description because of, its direct reference to the root word ‘edge”