These silicone boots will fit any tumbler that fits in a cup holder. -The color will vary slightly from what is shown. -For Stanley Quencher H2.0 40/30oz -Iceflow 20/30oz tumblers and many other tumblers, like Owala (snug fit). - Protection from scratch, skid resistance, and noise -Safe material mafe of food grade silicone -Easy to use: Just wipe the surface of the cup clean and dry. Slowly put the bottle boot on and squeeze out the air.