Gumboots aren’t often worn on the moors as more walking is involved than on covert days and the boot must protect the ankles from possible sprain injuries caused by slipping on wet or rocky ground.
My favourites are Viking boots, now sold under the name Harris. Made from 100% natural rubber, they provide good ankle support, don’t need breaking in, dry easily if water goes in over the top, are waterproof, cheap and last for years. I’ve had the same pair for 20 seasons.
The Zamberlan Fell Lite is another good option. It’s a leather and Gore-tex walking boot that’s light, waterproof, comfortable “straight out the box” and provides sufficient ankle protection.
They protect against possible sprain injuries