COS KNITTED SILK HALF-ZIP POLO SHIRT Size M; color black; original price 99. This ribbed polo shirt is a great casual wardrobe addition – you can even wear it to add a sporty touch to tailoring. Designed for a contouring slim fit, it has a pointed collar, elbow-length sleeves and a modern half-zip placket. It's knitted from a premium blend of recycled mulberry silk and cotton for a soft hand feel. 55% Recycled mulberry silk, 45% Cotton