The Hydro Flask Straw Lid boasts a high-flow rate to quench thirst, and durability to withstand the most tenacious teeth. It’s top-rack dishwasher safe and has a convenient finger loop so you can clip your bottle when you’re on the go. Works with any of our Wide Mouth products. Straw Cut Guide: Trim 2.5" off the straw for the 18oz wide, 1.5" for the 32oz, and just a hair for the 64 oz. Please note that the Wide Mouth Straw Lid is not leak proof. Patent-pending design. Durable rubber straw with high flow rate. Made of durable polypropylene PP#5. BPA-free. Compatible with all newer styles of wide mouth bottles.