Lang Yarns Fifty knitting yarn, color 0007, is composed of 50% cotton, 50% wool and knits on knitting needles 3-4 mm (US 3-5 / UK 10-8) for a gauge of 23 st. and 34 rows.
In a 50g (1.75 oz) ball there are about 155 m (169 yd) so plan on:
600 g = 12 balls for men size M
450 g = 9 balls for women size M
300 g = 6 balls for children 10 yrs
Machine wash 30°C (86°F) with detergent for wool without fabric softener.