36 sts.
9 rounds rib, 3 rounds purl and knit.
Heel flap 15 rounds, 6-6-6
4 x (3 rounds purl & 3 rounds knit), 3 rounds purl, 1 round knit
Decreases every other round 4 times, then every round until 4 sts left.
Yarn through remaining 4 sts.

Total 55 grams.