Leak-proof LidOur leak-proof lid is designed to prevent liquid leaks. Once securely fastened, it ensures leak-proof performance, providing you with peace of mind during both use and storage of the tumbler. Never worry about liquid splashes again.3.Premium MaterialsMade of BPA-free plastic, food-grade and odorless, highly transparent. The reusable straw lid is easy to wash and keep clean.4.Practical FunctionThese flip straw lids can be opened or closed flexibly, easily operated with one hand. After closing the lid, it can prevent dust from entering and keep the liquid in the cup clean. The leak-proof design allows you to use your water cup more casually without worrying about leaks.5.Comprehensive SetThe set includes 2 pcs replacement flip straw lids, 2 pcs reusable straws to enhance your experience, make sure you have enough replacement parts.