I don’t know if you can really call these “boots”. They won’t keep moisture out but they’re really comfy and healthy for me feet. I wear them ALL the time.
The uppers are the tops of a pair of felted wool slippers made especially for me by Cindy Gleason. I wore those slippers until I wore the bottoms out. No, I don’t hoard things but I also don’t throw out something I might be able to use in another way. Cindy went to a lot of work to make these for me and the only worn out spots were the parts I walked on.
At some point the light came on and I harvested the soles from a pair of kids’ slippers I got max cheap at Target (cardboard between the foam sole and felted top was a dead giveaway) and had worn until the uppers fell apart.
I pulled everything off the soles, trimmed them to more closely match my feet, attached my anti-arch supports (I need support on the outside of my foot, not at the arch) and covered the works with a layer of leather. Then I trimmed the worn out bottoms off the felted wool slippers, serged the cut edge and hand stitched the felted wool uppers to my prepared soles.
I wear them with Smartwool socks and stay out of puddles and wet grass.