Coming from Castelli's Rain or Shine collection the RoS 2 Shoecovers are designed for performance from the sunniest days to the hardest rains. The Polartec panel on the front and 3 layers fleece-backed waterproof side panels are breathable enough to prevent moisture buildup on fair days and tough enough to keep the water out on wet days. Just wait and see how many more days you can ride when you are prepared for the elements.