These socks have a reinforced heel and are wonderfully warm.
If you knit loosely, go down one size on the needles.

Yarn:
A = Lettlopi 1418 straw
B = Lettlopi 9427 copper
C = Lettlopi 1703 mimosa
Size 38-40 EU, 5-6 UK, 7, 5-8, 5 US
Amount of yarn:
2 skeins of color A and 1 skein each of color B and C.
50g = 100m, 10 cm. = ca 18 m.
Alternative yarn should have the length of 90 – 110m/50g.
Double pointed needles: 3, 5 mm. (UK 9, US 4)
and 4, 0 mm (UK 8, US 6)