Dining fly . During a persistent rain, this may be your only escape from your tent to meet with other crewbies and to prepare and eat food. Otherwise a small polyethylene tarp gives protection at reasonable weight. Waterproof pants that cover the boots will prevent this. Another solution, especially if you are hiking in shorts, is to use gaiters.
Leather soaks up moisture unless treated.
The other solution is waterproof breathable liners in the boot. Examples are Gore-tex liners sewn into the boot lining or in sock form. Even plastic bread-bag liners work for short periods, but aren't breathable. They also allow friction to occur between the sock layers rather than against the skin, reducing the chance of blisters. Wool retains some insulating qualitites when wet.