Big, bold mugs are essential accessories for active lifestyles. Choose your member level --- we've designed a unique, colorful mug for everyone! 18 oz. mugs feature stainless steel construction with plastic linings. Bottoms are non-skid, providing stability. Double walls offer superior insulation for either hot or cold drinks. Screw-on tops have locking slide openings to prevent accidental spills. Specify member level when ordering. Please note: these mugs are not microwaveable or dishwasher safe. Imported.