Lang Yarns Copenhagen knitting yarn, color 0001, is composed of 100% cotton certified biological knitting into a mesh-like strand. It knits on knitting needles 4.5-5 mm (US 6-7 / UK 7-6) for a gauge of 18 m. and 27 rows.
In a 50g (1.75 oz) ball there are about 90 m (98 yd) so plan on:
650 g = 13 balls for men size M
500 g = 10 balls for women size M
350 g = 7 balls for children 10 yrs
Machine wash 30°C (86°F) with detergent for wool without fabric softener.