Presale Only. Presale will be open through Sunday, July 31. Orders will be shipped by August 31.. This flattering midi dress is made in our signature Tencel and organic cotton blend, featuring an asymmetrical skirt hem and a striking black and grey colorway. This design comes as a tank top as well.. Material. 66% Tencel. 28% Organic cotton. 6% Spandex. Care. Machine wash, cool. Do not bleach. Tumble dry low. What is Tencel?. Tencel branded lyocell and modal fibers are produced by environmentally responsible processes from sustainably-sourced natural material, most often eucalyptus wood.  Tencel fabric widely used in sustainable fashion for its soft and luxurious feel.