Lang Yarns Merino+ knitting yarn is a pure australian wool yarn that knits on knitting needles 4.5-5.5 mm (US 6-8 / UK 7-5) for a gauge of 17 st. and 24 rows.
There are about 90 m (98 yds) in a 50g (1.75 oz) ball so plan on:
800g = 16 balls for Men size M
700g = 14 balls for Women size M
500g = 10 balls for Children 10 yrs
Machine washable at 30°C (86°°F) with detergent for wool without softener, iron at low temperature.