ANAVY Merino wool slip-on overpants size M, overpants, pull-up Cover, wool overpants, Various colors:

Incredibly breathable and reliable wool diaper cover. The wetting zone contains an extra layer of wool for better performance. The best coverage for nighttime use. Very comfortable construction with no elastic bands, just wide comfortable hems.
Use
The wool cover can be used over any absorbent diaper - square, prefold or fitted diaper.

Fabric composition

lining and inner layer: 100% virgin wool
outer decorative layer: 95% cotton, 5% spandex
hems: 95% virgin wool, 5% spandex