Quality leggings from top brands like Nike, Reebok, etc., are durable and available in great shades. Theory is a well-recognized luxury fashion brand, and it is owned by its parent organization, Link Theory Holdings Co., Ltd. Theory also offers a unique range of elegant workwear for men and women, including blazers, dresses, and more. Charcoal black, olive black, matte black, stone black, and some popular shades in black.