Sipping just got even better. Ergonomically designed for pucker-free sipping . the Stay Smooth Straw Topper contours to your mouth's natural shape. Made of silicone . it fits the Quencher® H2.0 FlowState™ Tumbler or the Stanley Cross Bottle straw and is reusable . dishwasher safe and BPA-free. The anti-wrinkle straw topper comes in classic neutral tones so you can mix or match colors and keep your hydration glow going.