Thick Material Our cases are made of food-grade silicone, soft and flexible. The 2mm thickened quality makes it more durable, reusable, BPA-free, and child-safe. Size Reference Non-slip boots are 2.85 inches in diameter and 1.7 inches in height. Fits water bottle or tumbler bases with a diameter of 2.8-2.95 inches. If unsure of fit, please measure the bottom diameter of your bottle before ordering. Perfect Match - This silicone lid fits Stanley Neon Quencher Tumbler 20/30/40 oz, Stanley IceFlow 20/30 oz, and is also compatible with Hydro Flask Standard Mouth 18/21/24 oz, Wide Mouth 12/16 /18/20/24 oz and Simple Modern Tumbler 20/24/28 40 oz, and more other tumblers and water bottles with diameters of 2.8-2.95 inches. Extra Protection - Designed to protect the bottom of your water bottle or glass from damage and scratches, the neon cover offers strong protection, ensuring long-lasting durability and pristine condition. Provides a stable grip and reduces noise when placing the glass on the table. Neon Options - We currently offer a variety of colors to choose from, such as neon green, neon yellow, neon orange, neon purple, and neon blue. Listing: 1* Cup Protective Case