Introducing Regia Pairfect sock yarn. An ideal way to knit perfect matching socks. The yellow thread indicates the beginning of each sock . Simply cut the yellow starter yarn,cast on and off you go.when sock one is complete repeat by unwinding yarn to the yellow starter thread, cut off cast on and before you know it two matching socks. Pairfect yarn for Pairfect sock. 75%wool, 25% polyamide 100gms - 420mts/459yds Needles 2mm-3mm size will vary depending on gauge and project Machine washable but here at Suffolk Socks we recommend hand washing and drying flat.