These little cuties knit up fast with Bulky Weight or hand spun yarn. They are good for taking the chill off when you are sliding that (computer) mouse around.
Knit flat then seamed, there is no right or left, both are the same. Using bulky yarn makes for a stretchy fabric. You may easily make them bigger or smaller by adding or subtracting in the beginning and ending 6 rows.
Gauge is not terribly important. Experiment until you create a fabric you like.
It only takes about 75 yards of bulky yarn to make a pair. The red ones were knit with Malabrigo yarn, Mecha and the gray pair I knit with my own hand spun yarn.