To make a coffee cup cozy you will need:

4.5mm hook
worsted weight yarn of your choice
a yarn needle (bent-tipped Clover or Hiya Hiya™ are my favorite

special stitches:

SC decrease: insert hook into next st, YO and pull through to front (two loops on hook), insert hook into next st, YO, pull through to front (three loops on hook), YO, pull through all three loops. SC decrease made.

Chain 14

Work in the back ridge loop for the first row only:

Row 1: 2sc in 2nd chain from hook, sc in each of the next 10 ch, insert hook into next chain, YO and pull through to front (two loops on hook), insert hook into last chain, YO, pull through to front (three loops on hook), YO, pull through all three loops, sc decrease made. Chain 1 turn. (13 sc)

For the next 19 rows you will work through the BACK LOOPS ONLY.

Row 2: sc decrease over next two stitches, sc in each of next 10 sts, 2 sc in last st. Chain 1 turn. (13 sc)

Row 3: 2sc in first st, sc in each of next 10 sts, sc dec over last two sts. Chain 1 turn. (13 sc)

Rows 4-19: Repeat rows 2 and 3 eight times more.

Row 20: Repeat row 2. DO NOT FASTEN OFF.

With right sides together, insert hook through both loops of stitch just completed and through both loops of the last chain of the foundation row. Yarn over, and complete a slip stitch.

Continue to insert the hook through both loops of the corresponding stitches. (13 sl st)

The wrong side of the project is now facing out. Turn the crocheted cylinder you have just made right side out.

Bottom edge

Round 1: Chain 1. Mark this chain with a moveable stitch marker. It counts as your first sc. Working into the edge of what will be the bottom of the coffee cup cozy, make 19 evenly spaced sc. Join with slip st to first chain made. (20 sc).

Round 2:Chain 1. Mark this chain with a moveable stitch marker. It counts as your first sc. *Skip next stitch, 3 dc in next stitch, skip next st, sc in next st, repeat from * three times more. Skip next stitch 3 dc in next st, join with slip st to beginning chain 1. Fasten off leaving a tail of at least 4″

Turn the coffee cozy 180º so that the edge just completed is at the bottom.

Top edge

Round 1: With a slip loop on your hook (one loop on the hook), insert the hook into the edge you are now working on. YO and pull through to front (two loops now on the hook), YO and pull through both loops. First sc completed.

Working into the edge of what will be the top of the coffee cup cozy, make 19 evenly spaced sc. Join with slip st to first sc made. (20 sc).

Round 2:Chain 1. Mark this chain with a moveable stitch marker. It counts as your first sc. *Skip next stitch, 5 dc in next stitch, skip next st, sc in next st, repeat from * three times more. Skip next stitch 5 dc in next st, join with slip st to beginning chain 1. Fasten off leaving a tail of at least 4″

Now all that is left to do is weave in the ends and make a coffee run.