Lang Yarns Oslo knitting yarn, a savvy blend of wool and cotton, is composed of 46% merino wool, 42% cotton et 12% camel hair and knits on knitting needles 3-3.5 mm (US 3-4 / UK 10-9) with a gauge of 26 stitches and 34 rows.
In a 50 gram (1.75 oz) ball there are about 150 meters (164 yd) so for quantities of yarn plan on:
550 g = 10 balls for men size M
400 g = 8 balls for women size M
300 g = 6 balls for children 10 yrs.
Machine wash et 30°C (86°F) with detergent for wool without fabric softener.