Protective boots are specifically designed for most water bottle brands and models or other car travel tumblers. Designed to provide a protective layer, this silicone boot helps your tumbler bottom against scratches, and minor impacts, extending its lifespan. Advantage: Bottom boot is made of soft and flexible silicone, anti-slip and anti-fall, reusable and washable. Instruction: Bottom sleeve protector is suitable for various settings, such as the car, office, gym or at home, providing versatile and long-lasting protection for the bottles, reducing noise and preventing scratches and damage. Note: Please measure the diameter of the cup bottom before purchasing to ensure a proper fit.