Vipere's tongue socks pattern

In addition to the pattern, you'll need the following material to knit this project :

• 1 skein of Bis-Sock self-striping yarn (color "Knight") and 1 skein of Bis-Sock semi-solid (color "Acajou")
• Straight needles of 2.5 (or size needed to obtain gauge) : you can use circular needles but these socks are worked entirely in back and forth rows, with no sewing at all !!

Pattern in PDF format: even if this pattern is free, you must complete an order to get the link to download. Thank you !!