【Initial Letter Cup Boot】 If you desire a personalized touch for Stanley 30 oz or 40 oz tumbler, the Initial Letter Cup Boot is a great choice. This accessory ensures you won't mix up your tumbler with others anymore. 【Perfect for Stanley Cup】 The silicone cup boot is perfect for Stanley Quencher H2.0 40 30 20 oz & IceFlow Flip 30 20 oz water bottle. 【Wide Compatibility】 With a diameter of 3inch /7.6cm, the silicone cup boot fits tumblers with a bottom diameter of 2.8-3.1 inches. The cup boot also compatible with Yeti Rambler 20 oz and Hydroflask 12-24 oz water bottles. 【Food Grade Material】: Made of food grade silicone, the tumbler boot are durable, reusable, and easy to clean by hand or in the dishwasher. They're airtight and sealed, making them perfect for indoor and outdoor activities. 【Anti-Slip & Protect Your Tumbler 】The cup boot is designed with anti-slip features to prevent your bottle from tipping over or sliding on smooth surfaces. It also provides protection against scratches, dents, and other damages for your water bottle. Velaco Initial Letter Protective Silicone Boot for Stanley Quencher H2.0 40 30 20 oz & IceFlow Flip 30 20 oz, BPA Free Anti-Noise Anti-Scratch, Tumbler Protector Sleeve Cover Boot