This is the most useful cool-to-cold weather garment we offer. You'll wear it five days a week for five months of the year, on and off the bike.
All superfine merino wool, not scratchy, no problem.

Ours are made either in New Zealand or Australia. Minor differences, but nothing significant. They're the same weight, the same overall feel, and exactly the same function.

They all have thumbloops, which well, most of the time you won't use them, but every now and then you might. They're all cut kind of long. They're also all cut kind of slender, so that if you have a 42 chest, for instance, and you want a looser fit, get a 2XL.

They're machine washable and dryable, but wash warm---and as for drying, let the sun or air do it. You don't have to, but they'll shrink less that way. They don't shrink a lot in any case.
Wool weight is 260g per square meter, compared to 200 on the sleeveless, short-sleeve, and long-sleeve crewnecks.
Good alone or layered. BUY UP A SIZE OR TWO.

Here's a sizing chart.