The Giant Yarn We Use
Is actually not yarn at all but felted wool roving a.k.a. wool tops
(Merino, Corriedale, Shetland and Blue Face Leicester work the best for arm knitting yarn).
Also the blends CONSTELLATION and BAMBINO (from the website below)
felt up nicely as yarn.
Get It Directly From The Woollen Mill
Wool roving can be bought in hundreds of colours and blend variations
directly from a family run woollen mill
for an incredibly reasonable price from here:
How To Felt Wool Roving For Yarn Tutorial
The felting process prevents it from shedding pilling and fuzzing out later,
you’ll be glad you felted it!