The silicone bands make it easy to track fluid consumption; wear them as bracelets or roll them up the tumbler each time you refill it. At the end of the day, you can quickly calculate your water intake by counting the number of bands. They can be rearranged to personalize the tumbler, and they also act as a textured, no-slip grip. The press-in lid has a silicone gasket, so it stays in place, and a built-in tab for easy removal. The straw is wide and easy to clean, great for shakes and smoothies, or you can drink directly from the smooth-edged tumbler. When the straw is removed, you can use the built-in stopper in the lid to create a spill-proof seal, allowing simple mixing of flavors and powders, as well as confidence while traveling. The tapered design fits in most car cup holders. The tumbler is made of break-resistant plastic, with insulating double-wall construction to keep drinks cold for longer while reducing condensation. it is dishwasher safe, BPA free, and holds 20 ounces. Replacement bands are available. Patented.