If you regularly run on trails or in
very icy, slushy, or
muddy conditions, it's worth checking to see if your favorite shoe comes in Gore - Tex, the lightweight, waterproof material found in all kinds of outdoor gear.
I made two last - minute changes, adding a
very lightweight wind - breaker / rain jacket, and tossing in an older pair of loafers that I didn't have to worry about in either wet or
muddy / sandy
conditions.