For moisture management/warmth in colder weather, we're also checking out mesh baselayers [1] since merino does not dry quickly under multiple layers.

[0]: https://nuyarn.co.nz/ [1]: https://www.brynjeusa.com/product-category/super-thermo/

I rotate through 3 merino T-shirts alternating one every day. If they start to smell, you can just hang them out for the night and they'll be fresh as daisies again.

I think I wash them like once a month or two in a wash that has lanolin in it, which replenishes the natural fats in the fiber and makes it last longer.

the 3 or 4 I have are pretty covered in holes now (no, not moths), I just keep them around for base layers during the winter.