The Owala SmoothSip Slider 20 oz thermal mug is designed for smooth, spill-resistant sipping on the go. Made from durable 18/8 stainless steel with double wall construction and vacuum insulation, it keeps beverages hot or cold for hours. It features a threaded lid with a sliding closure and sip opening for added control and convenience. Finished with a durable powder coated exterior for a stylish, comfortable grip.