【Triple Silicone Leak - Proof】This 40 oz tumbler lid replacement offers outstanding leak - proof performance.The soft and thickened three - layer threaded silicone design perfectly wraps the edge of the cup, preventing liquid from overflowing from the cup rim. The push - type straw can block the water flow when closed, so you don't have to worry about water spilling from the straw mouth. 【Perfect Fit】This 40 oz stanley flip straw lid is specially customized for Stanley cups. The three - layer silicone threaded seal design perfectly fits cups like Adventure Quencher Travel and Quencher H2.0 FlowState. Even when the cup is tilted or shaken, this stanley cup lid ensures no leakage. This Stanley replacement lid ensures a comfortable fit every time. 【Arbitrary Straw Orientation Adjustment】After the lid thread fits tightly with the cup mouth, simply rotate the lid, and you can easily adjust the straw to any angle you like. No more discomfort caused by the straw and the cup handle. The stanley cup flip straw provides great flexibility in this regard. 【Easy to Clean】These Stanley lids can separate the silicone from the plastic. You can either wash it by hand or use a dishwasher for convenient cleaning, which saves your hands. 【Simple Installation】When using, press the lid vertically into the cup mouth to make the lid parallel and tightly fit with the cup mouth. There's no need to rotate it in, so you won't have the trouble of misaligned threads. This is a great feature of this stanley leak proof lid. 【Hidden Straw】The flip straw stanley design takes practicality to a new level.When not in use, you can circle the straw inside the lid. It not only saves space but also effectively prevents dust from entering the straw, making your drinking healthier. 【Food - Grade Safe Materials】This reusable silicone folding straw lid is made of high - quality food - grade ABS materials. It is anti -drop performance, wear - resistant, environmentally friendly, and odorless. You can use it with confidence. This stanley top is a safe choice for daily use. 【Combination Set】The set includes a highly transparent silicone lid and a 24cm/7.9in long soft straw. The straw is soft and flexible, allowing you to reach any corner at the bottom of the cup and enjoy every sip of your drink easily. Among the popular stanley lids 40 oz leakproof, this set stands out. Meet the Stanley Flip Straw Tumbler! This is an excellent leak proof Stanley cup lid replacement that ensures your drink stays comfortable inside. The Stanley Protour models benefit greatly from this lid.With its no spill design, the Stanley Flip Straw Lid provides a spill proof experience. It's a perfect replacement for your 40 oz tumbler lid. If your 40 oz Stanley cup lid needs a swap, this Stanley top, with its flip straw, is a must - have for Stanley lids users seeking leak proof performance.