The Waterproof Bike Seat Kit includes both a custom Waterproof Rain Cover, designed specifically for Selle Anatomica saddles, and Saddle Sauce, also specifically designed for Selle Anatomica. Importantly, Saddle Sauce will not soften the leather, unlike Brooks Proofide, which is designed to speed the break-in process. No need for that here. The saddle can be ridden while the waterproof bike seat cover is installed.