The Resistors have kept our feet 100% dry during long, wet rides and they add a good level of warmth too.
They're made from soft, fleece-backed polyurethane that doesn't let any water through, and the seam down the front is taped to prevent leakage. A locking zip at the back takes care of closure and a little flap at the top stops it snagging your Lycra.
Reflective logos and piping add visibility. The bottom of the boot is open so you don't get quite the insulation that you do with fully enclosed overshoes, but that's only an issue in the coldest weather.