In the summer I wear Keen sandals and I just get wet. Other times I wear Showers Pass Touring shoe covers. Not made for SPD. I'm afraid you'll have a tough time finding a shoe cover that will keep your feet totally dry. Most neoprene shoe covers are more for warmth than waterproofness. In the early spring and fall when the morning temps start to dip I use Louis Garneau shoe covers over the sandals to keep the feet warm. But they don't keep 'em dry. The only ones that I've experienced to keep the feet totally dry in a torrential downpour are the heavy duty ones from Showers Pass. They work great, but again, aren't made for SPD. Good luck in your search.