For your consideration is a navy blue sweater polo from Wolf vs. Goat. This item originally retailed for $740. As per the website:

100% Yak Johnny collar 5 gauge 4-ply 2/15nm around 1 kilo. This thing is a beast. The ply count is low because the yarn size is much thicker than we usually use. We couldn't make it any thicker because the machine can't accept anymore ends of yarn.

Yak fiber is naturally breathable and great at regulating moisture. It absorbs and releases water vapor from both the air and your body, helping your temperature stay steady whether you’re indoors or outside. It also wicks moisture without ever feeling damp, so you stay comfortable as conditions change.

Yak down is soft, durable, and friendly to sensitive skin. With fibers usually in the 16–18 micron range, it’s right in fine cashmere territory, but it has no lanolin, which makes it naturally hypoallergenic. It’s also stronger and often longer than cashmere, so yak sweaters resist pilling and hold up beautifully over time.