SMOOTHER, MORE COMFORTABLE SIPPING: Ergonomically designed for pucker-free sipping, the Stay Smooth Straw Topper contours to your mouth’s natural shape for a more comfortable drinking experience. SOFT & DURABLE SILICONE: Made from soft, flexible silicone, this straw topper is reusable and designed for everyday use while maintaining its shape over time. COMPATIBLE WITH STANLEY STRAWS: Designed to fit the Quencher H2.0 FlowState Tumbler and the Stanley Cross Bottle straw for a secure, stay-put fit. DISHWASHER SAFE & BPA-FREE: Easy to clean and safe for daily use, this straw topper is dishwasher safe and made with BPA-free materials. MIX, MATCH & REUSE: Available in classic neutral tones so you can mix or match colors while keeping your hydration routine looking good.