The Coldest Water Insulated Wide Mouth Cap, Patent Pending, was initially built for Professional Athletes in high performing sports. We believe in taking cold water on the go wherever you are, whether your biking, cycling, running, jogging or going to the beach. This cap allows you drink effortlessly with one hand. Simply flip the top, and drink water from it. Easy to clean. The flip top has a unique tab that allows you to push it without your fingers touching the mouth piece. Multi-compatibility Technology: We believe in multi-compatibility, so we've extensively tested this with our Widemouth 32 oz and 64 oz - The Coldest Water Bottle, as well as other Stainless Steel Bottle Brands. Verified Compatibility with: The Coldest Water Bottle 32 oz and 64 oz Wide Mouth Bottles 32 oz wide mouth bottles 40 oz wide mouth bottles 64 oz wide mouth bottles Possible compatibility: Stainless Steel Bottles with 2.19" inches inner screw mouth diameter. . Enjoy our COLD SOLID guarantee. If for whatever reason you are not 100% happy, we will refund or replace your item. Click the "Add to Cart" button at the top of the page to order Now. Warning Use extreme caution when using with hot liquids. Depending on altitude, pressure, temperature and other factors may affect bottle and performance.