1. Perfect Fit: These 40 oz tumbler lids are compatible with Stanley Quencher Adventure Travel tumbler 40 oz and other brand 40 oz tumblers, such as the Stanley 40 oz Tumbler with Handle. 2. Splash - Resistant and Spill - Proof: Without removing the lids, these clear 40 oz tumbler lids allow you to know how much drink is left. They are splash - resistant and offer some degree of heat insulation, helping to prevent spills when the tumbler is turned over and keep the drink somewhat insulated. 3. Safe and Reliable: The 40 oz tumbler lids replacement are made of environmentally friendly and non - toxic food - grade material and are BPA - free. They are dishwasher - safe, lightweight, can come into direct contact with the drink, and are easy to clean. 4. Practical and Convenient: The Stanley lids are designed with a slider that is easy to slide. They can be used with tumblers for water, juice, tea, wine, coffee, milk or other drinks. You can use them to cover your tumblers when travelling, driving, camping, doing sports, working, etc.