I knit these woollen socks. It's a variation from Kerstin Balk's SoxxBook Family & Friends by Stine & Stitch but not exactly from her design. I used Kotikulta's Tuokio yarn (75% wool, 25% polyamide) (100g = 200m) in white and red shades.
This pair has German Short Row heels. It is the most common heel in all the commercial socks you can buy. But it is not the most durable one. Excellent choice for the woollen socks you are going to wear at home, school or work if you are not going to walk a lot.
German Short Row heel is called also Hourglass or Boomerang heel.