the go! These tumblers are designed with a double stainless steel wall that keeps your drinks cool or hot for hours so you can enjoy your beverage throughout the day while you work or run errands. Each tumbler comes with an acrylic lid that has a silicone seal to lock in the liquid to avoid spills, and can be switched from straw use to sip use with the slide to adjust cap. Stainless steel straws are washable and reusable, including a silicone tip to protect your lips and teeth from contacting metal directly. Matte solid colored exterior is sleek, simple, and perfect for personalization! Take these tumblers with you on the daily and keep yourself caffeinated and hydrated!