Easy to open and close-switch sliding cover design, easy to use. The hole on the top of the cup can be used directly or with a straw. The sliding cover design prevents you from touching your nose while drinking water.$Excellent compatibility-the lid can replace 30 ounces (the inner diameter of the cup is about 3.58 inch) insulated stainless steel cups of any material, but it is not suitable for RTIC flat-bottomed cups In order to avoid you to buy an inappropriate size lid, before buying Please measure the inner diameter and outer diameter of the cup.$Splash-proof-The edge of the flat-bottomed cup lid is lined with a silicone gasket to prevent splashes and major spills when the cup is turned over. There is an air hole on the top of the slider, through the air ergonomics, which helps to reduce splashing. $High-quality materials-made of high-quality raw materials, can be used for a long time, BPA-free, easy to clean, and can be cleaned in a dishwasher.$Quality Assurance-Buy our products, we will give quality assurance, if you have any questions or dissatisfaction with our products, you can contact us, we will do our best to serve you.