The cleat covers are also a good way of keeping dirt and sand (or ice in the winter) out of the cleat. Remember, the mechanism is in the cleat on Speedplays. They are far more sensitive to dirt than Looks or Times. On a very cold winter ride, I stopped for a break and stood in snow for a minute or so. When I tried to click back in, I found that the cleat was completely iced up. I had to ride home by just balancing my foot on top of the pedal. That being said, I wouldn't use anything other than Speedplay's. The float, smooth release and comfort are superior. I just make sure to slip the cleat covers in my pocket when I go for a long ride.