Merino with the look and feel of silk and the softness of cashmere! Optim is a very fine Merino wool processed through special equipment that stretches the fiber. It increases the staple length and the micron to 12–14. The longer staple length means that it is more resistant to pilling, although by permanent altering the length of the fiber you are sacrificing some of the memory imparted by crimp. ½ pound put-up; top (combed); 12–14 microns; 3''–4'' (7½–10 cm) fiber length.