A pure merino, super chunky wool - 100g ball. Knits on a 15mm needle so immediate results are guaranteed. 1 ball makes a great hat for men and women, while 3-4 balls makes a soft mock-neck sleeveless shell.
Looking for more options, or just a little inspiration?
GGH Aspen Yarn is a similar (1.5 - 2.5 sts/in) Super Bulky weight, Merino Wool, and Hand Wash yarn. You make like Tahki Stacy Charles Maya Yarn, which is another (1.5 - 2.5 sts/in) Super Bulky weight yarn.