Due to manual measurement, the size and weight may have a certain error. Due to the difference between monitors, there may be a slight color difference. This boots is compatible with the Owala SmoothSip Slider Coffee Tumbler in two sizes: 20oz and 12oz. It can be switched between the two sizes of Owala Cups and fits perfectly Compatible with Owala SmoothSip slider boots are made of durable, BPA-free silicone, which is both flexible and sturdy. These boots protect your glasses from dents, scratches and sudden slips, while providing excellent stability on any surface, allowing you to use your coffee cups with peace of mind It is equipped with an anti-slip design, allowing your cup to stand easily on smooth surfaces and remain stable. This ensures that you no longer have to worry about the bottom of the cup being scratched or bumped, whether you are commuting, hiking, or enjoying outdoor adventures The protective cover design of the Ovara coffee cup makes it easy to install and remove. Simply hand wash or put it in the dishwasher to keep your cup looking fresh and stylish