. . . are the best ways. In my case, puttees. A nuisance to some, I know, but I always found them comfortable and effective. Certainly more comfortable than high boots. And last week, setting off for a week's walking, I couldn't find my whizzo zippy Goretex gaiters - but no matter, because my old puttees did the trick. I don't think I have come across a better way to seal trousers to boot tops. Best of all, when your trousers get wet, puttees don't allow them to wick water down into your boots the way even the best modern gaiters do. I suppose you have to have reasonably high boot tops and they wouldn't work with a lot of modern, low walking boots, but they worked very well with my Alt-Berg Peacekeepers once I had removed the rather large pieces of sponge padding from the tops of the tongues.