Lang Yarns Donegal knitting yarn is a pure wool yarn made in the true Irish tradition, knits on knitting needles 3.5-4 mm for a gauge of 22 st. and 30 rows.
In a 50g ball there are about 190 m (207 yd) so plan on:
450g = 9 balls for men size M
300g = 6 balls for women size M
200g = 4 balls for children 10 yrs
Hand wash with detergent for wool without fabric softener.