The saddle cover is easily attached to a bicycle saddle. Against light rain and drizzle protects the cover and is watertight. For long-lasting and heavy rain fails the terms after all. However, if the wheel is in the night outdoors on the lawn, then the saddle is a little damp in the morning by the rising Taufeuchtigkeit. This can however be explained by the dew of the bottom of the elastic band passes to the saddle. Since only a plastic bag would protect the knotted under the seat. But since I have also eager nor a motorcycle coating overnight is the Taufeuchtigkeit in combination with the saddle cover hardly worth mentioning. So I can only say, in most cases helps the protective cover and that's already something, especially for the price.