Materials
4 balls of Lido DK per size and,
2 balls of No. 5 per size.

A single strand of each is used - Note the Lido DK is:

Made of two very different strands, one cotton, one viscose. These are inclined to slip against each other while knitting and the cotton will gather up. Simply avoid a knot forming and carry on knitting. This will not affect the garment.