Yarn yardage approximate. Gauge measured “at rest” (unstretched).

Size given fits the hard plastic Starbucks reusable coffee cup.

The linked blog post provides more description about construction and design details.

The post gives three free PDF patterns for items employing double rib: this cup cozy; Double Rib Ballet Slippers; and a bottom-up baby hat with 2x2 rib fold-up cuff.