Michael Stars Rock Solid Reversible Ruana in Black. Michael Stars Rock Solid Reversible Ruana in Black. 55% poly 20% nylon 20% acrylic 5% wool. Dry clean only. Attached hood. Reversible. MICH-WK285. MS21115. Supima, modal, shine-all the words we've come to love and adore from Michael Stars. More gorgeous tops in the most season-appropriate colors for layering all day and night long.