Regia 4 Ply Color - get creative with Regia Color. This range has everything from self-patterning effects in many variations to colour mixes with short pattern repeats. The classic and renowned sock yarn from Regia comes in 100g balls. One ball is enough to knit a pair of socks. Four single yarns are twisted or 'plied' together to create the ideal yarn weight for hand-knit socks. Holds its shape well and gives long-lasting results.