Description from MagKnits:

 
You'll be the envy of all your caffeinated friends when they catch you toting your "to go" cup with this sassy little java sleeve. Versatile yet practical, the Java-a-Go-Go will fit standard 12- and 16-ounce paper coffee cups. Add the finger holds and no cup will slip through your fingers ever again. Inspired by the cardboard cup sleeves found at various coffee shops, the Java-a-Go-Go will keep your fingers burn free in style and help save the environment at the same time!

Any fingering weight yarn that matches the gauge will work--use yarn from your stash whenever possible! For the contrasting yarn, any eyelash or novelty yarn that strikes your fancy will do! Use your imagination.