It's the first time I buy a Geelong Wool sweater, I'm used to other wools like cashmere, merino, lambswool. I hope it's as comfortable.
Should be. IIRC, Geelong just another breed of sheep, in the same way that Merino is. Both are historically known for produing higher quality wool than some other breeds. If there's an additional designation (e.g. fine, superfine, ultrafine, etc), that tells you the approximate range of fibre width in the garment. Geelong, like Merino, tends to produce more of the thinner/finer threads while still retaining strength. Cashmere, from the eponymous goat, also tends to be predominaantly composed of finer strands than regular wool. Assuming equal processing/treatment, finer strands tend to feel softer, which accounts for these fabrics being more highly sought after.