Guyot Designs Splashguard - Universal size fits ALL wide mouth bottles. Made from flexible silicone the Universal Splashguard has enough flex to conform to the size variations of different brands' wide mouth bottles. The SplashGuard is an insert which provides a smaller drinking hole, blocks the splash, is easily removed for cleaning, and is dishwasher safe. Allows for easy filling without removing the SplashGuard. Universal size fits ALL wide mouth bottlesMade from flexible siliconeUniversal Splashguard has enough flex to conform to the size variations of different brands' wide mouth bottlesThe SplashGuard is an insert which provides a smaller drinking hole,