Righteous Rags is a licensee of Supima, known as the world's finest cotton. Supima's exceptional characteristics at the fiber level translate into optimum performance for fabrics. Supima is an abbreviation for Superior Pima, a trademark name for the longer, stronger and finer cotton. Yarns and fabrics made from Supima® cotton produce softer, silkier and more lustrous fabrics. For this reason, Righteous Rags has chosen Supima for its knit apparel.

Supima offers special advantages of Extra-Long Staple Pima cotton grown exclusively in the American west and southwest. According to the Supima organization, "Each year over 120 million bales of cotton are produced around the world. Of this total harvest, less than 1% or approximately 700,000 bales are judged to be good enough to be eligible to carry the Supima name.

Supima is the only cotton in the world marketed for its quality. Fine cottons are often marketed according to country of origin. However, country of origin is no guarantee that the cotton meets Extra-Long Staple (ESL) Cotton. Additionally, generic trade names used to describe cottons do not serve as a warranty for quality. Supima labeling is the only assurance that the product being purchased is made of luxury ELS cotton."