Founder Sara Blakely has unveiled the new line of jeans, which contain stretch technology supposedly twice as more powerful than regular denim. Spanx, everyone's favorite shapewear line, is launching denim! Founder Sara Blakely has unveiled the new line of jeans, which contain stretch technology supposedly twice as more powerful than regular denim. If the new Spanx jeans are anything like Spanx shapewear, sign us up!