1.Silicon material: This cup cover and the rubber underside are made of silicone, and reliable. It is harmless and withstands high and low temperatures as well as wear and guarantees a long life. 2.Effective cup protection: The silicone cover effectively protects the bottom of the cup, against abrasion and extends the life of your cup. It provides a barrier between the cup and everything on which it is placed, keeping your cup in good condition. 3.Size options Available in two different sizes, this cup cover is suitable for various sports bottles. The size with a 5 cm diameter fits bottles with a capacity of 12/16/18/21/680.4 g, while the 9 cm diameter fits 32/1134 ml bottles. It versatility and compatibility for different bottle sizes. 4. Various colors to choose from: Choose from a variety of color options, including white, royal blue, grass green, orange, black, red, yellow, pink, warm gray, cyan, dark gray, dark blue, army green and purple. Find the perfect color that matches your style and preferences.