100% LEAK-PROOF: The innovative retracting straw technology ensures you can toss your tumbler in your bag worry-free. HIDE A STRAW TECHNOLOGY: With a quick turn of the lid dial, the straw tucks neatly away, making the lid leak-proof and keeping the drinking surface clean when not in use. CUP HOLDER FRIENDLY: The sleek, tapered design fits perfectly in most cup holders, making it ideal for on-the-go hydration. KEEPS COLD FOR HOURS: Keep drinks cold for up to 24 hours, so your favorite beverages are always at the perfect temperature. DISHWASHER SAFE: Designed for convenience, the Oasis Tumbler is both BPA-free and top-rack dishwasher safe for easy cleaning.