This pattern uses an hourglass-shaped heel, which works just fine for some folks but is can be confusing until it ‘clicks’. More recently, I have reworked the pattern to use the Afterthought Heel, where you leave a hole where the heel should be, then return to it after to fill it in. Here is the link to the newer version.

From the pattern: “It has a very nice heel shaped using short rowing. This is a technique usually associated with knitting but works great when adapted for crochet. Working from the toes up, you will be able to try on your sock as you crochet to ensure a perfect fit.”

Fingering or sport weight yarn, 100 grams/size E hook, or size needed for gauge: 5.5 sts/inch in patt,
OR DK or light worsted weight yarn, 100-200 grams/size G hook, or size needed for gauge: 4.5 sts/inch in patt,
OR heavy worsted or bulky weight yarn, 200 grams/size I hook, or size needed for gauge: 3.5 sts/inch in patt.

Note: The amounts of yarn given are for ankle socks to fit medium adult feet. For knee socks, you will need up to twice as much yarn as for ankle socks. Also, socks for smaller feet will use much less yarn than socks for larger feet.