Folks,
One maker that doesn't seem to have been mentioned is Baxter (NSW), gave away RM for Baxter about 50 years ago, never looked back.
Amongst other things, the "rubber" soles and stitching seems impervious to Skydrol, and important consideration in many jobs.
I use the same ones that were uniform issue to NSW police for many years, 22D if I recall correctly.
Tootle pip!!