Stanley 40 oz Quencher Boot And Straw Cover Set. Take pride in how you hydrate with the Quencher Boot and Straw Cover Set. These sets color match the silicone accents of popular Quencher shades. Protect your hydration companion from nature, weather conditions or crowds while commuting. The quencher Boot fits snugly on the tumbler base for softer, quieter landing. This means fewer scratches and provides a nice grip. The soft silicone Straw Covers - shaped like your favorite tumbler - keep your Quencher looking good while you stay hydrated. Includes 1 Quencher Boot & 2 Quencher Straw Covers. Silicone. Dishwasher safe. Imported.