WIDE COMPATIBILITY: Fits most standard 20 oz tumblers with a 3.2-inch (approx. 8.1cm) inner mouth diameter. This tumbler lid is designed for a snug fit on a wide range of brands. To ensure a perfect seal, please measure your cup's inner diameter before purchasing LEAK-PROOF DESIGN: Featuring an upgraded silicone ring and double-seal design, effectively preventing spills in your bag or car. Ideal for busy days, or travel, you can carry your drink with greater peace of mind SAFE & CLEAR MATERIAL: Crafted from high-quality, BPA-free, transparent AS plastic, this tumbler lid prioritizes your safety. The sturdy, food-grade body gives you confidence in every sip, while the clear design lets you easily see how much drink is left EASY TO CLEAN – DESIGNED FOR LONG-LASTING PERFORMANCE: Quickly rinse under running water by sliding the closure back and forth—no disassembly needed for a fresh and hygienic daily clean. The snug-fit slider is built to stay in place, preserving seal integrity and ensuring smooth, durable performance over time without any extra hassle CONVENIENT ON-THE-GO: Perfect for busy professionals, travelers. This tumbler lid helps keep your drink secure and maintain its temperature, making it a reliable companion for commuting, workouts SUNRAYNEST Tumbler Lid Replacement 4 Pack for 20 oz Tumblers - Compatible with Yeti Rambler & More 3.2" Mugs, Spill Proof and Splash Resistant Crystal Clear Sliding Lids, BPA-Free, Straw Friendly