The tag mentions close too 100% cotton, but also “biocide”. So probably not the best for the environment, but it still works after a couple hundred washes

If smell is an issue, try different clothing. A couple years back i discovered “anti-microbial” shirts. I have no idea what they’re treated with, but they basically suppress BO. If i wear normal cotton t-shirts, i feel like i reek in the early afternoon. On a more natural sode, I’ve recently had very positive experiences with merino wool clothing.