Lang Yarns Cashmere Classic soft knitting yarn is composed of 100% cashmere and is finer than the Cashmere Big, knits on knitting needles 6-7 mm for a gauge of 16 st. and 22 rows.
In a 25g ball there are about 50 m (54 yd) so for quantites of yarn plan on:
600g = 24 balls for men size M
450g = 18 balls for women size M
300g = 12 balls for children 10 yrs
Hand wash with detergent for wool without fabric softener.