Michael Stars Yak Notch Collar Coat in Gray. - size M (also in ) Michael Stars Yak Notch Collar Coat in Gray. - size M (also in ) 40% acrylic 38% wool 20% nylon 2% spandex. Dry clean only. Open front. Side pockets. Rib knit trim. MICH-WO446. SKY54. 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.