Lang Yarns Fire knitting yarn from the Wool Addicts collection is composed of 98% wool, 2% polyester and knits on knitting needles 9 mm (US 13 / UK 00) for a gauge of 9 stitches and 13 rows.
In a ball of 100 grams (3.5 oz) there are about 75 meters (82 yd) so allow:
1000 g = 10 skeins for men size M
800 g = 8 skeins for women size M
500 g = 5 skeins for children 10 yrs.
Machine wash at 30°C (86°F) with detergent for wool without fabric softener.