Serenity 20 is a beautiful fingering weight blend of merino, cashmere, with a hint of nylon. Crisp, sqooshy, lovely - the merino is ultrasoft, and given a new lease on life by the addition of 20% ultrafine cashmere. The nylon gives it strength and fluidity, and of course, makes it the perfect sock yarn. Oh, how I want socks in this yarn. You will too - once you touch this fabulous, handpainted fiber. Please keep in mind that every single skein is unique in this brand - though they are dyed together, and they work together, and when knit together will be gorgeous but they are not going to be 'identical' or 'perfectly matched'