Lang Yarns Enya knitting yarn is a soft yarn composed of 65% alpaca, 35% nylon and knits on knitting needles 5 and 5.5 mm (US 8-9 / UK 6-5) for a gauge of 17 stitches and 25 rows.
In a 25 gram (0.85 oz) ball there are about 150 meters (164 yd) so plan on:
500g = 20 balls for men size M
400g = 16 balls for women size M
300g = 12 balls for children 10 yrs.
Machine wash at 30°C (86°F) with detergent for wool without fabric softener.