Description Compatibility: Silicone boot designed for Stanley Tumblr Adventure Quencher 40 oz & Stanley IceFlow 20oz 30oz, Extend Service Life: a silicone boot for stanley 40 oz quencher can avoid dent, collision, scratches, and reduce the metal collision sound Allowing to enjoy your tumblr for a long time Premium Material: Made of soft and stretchy silicone, reusable and durable, perfect fit the cup bottom and won't fall off easily Easy to Install: Before installing the silicone boot sleeve on your water bottle, make sure the bottom of the bottle is clean, then insert the water bottle into the sleeve until all the air is squeezed out