Jacquard knit is a weft double-knit fabric which use a Jacquard mechanism. This device individually controls groups of needles, creating very complex designs. From Jacquard knits derives Jersey stitch, which is smooth flat face o front, while on back has uniformed texture.

Jaspé is a type of woven fabric, characterized by an irregular effect. This peculiarity is obtained twisting 2 or more yarns of different colors that creates different shades on the fabric. Is mostly involved for drapery, upholstery and suiting.

Jute is a natural bast fiber, chiefly from India. Is used principally for gunny sacks, bags, cordage, and binding threads in carpets and rugs.