Ring Ring Denim
This is the term for traditionally made denim, where ring-spun yarn is used for both the warp and the weft. The yarn is created by rolling the fibres, rather than pressing them into shape, and creates a contrasting structure with a slightly washed denim look. Also named ‘double-ring spun denim’.
Source: Nouvelle de Nîmes Nº 5: The Denim Dictionary