Swig 18-ounce Golf Partee Mug is perfect for golf enthusiasts. The dimpled design really looks and feels like a golf ball! Thanks to Swig's triple insulation technology, this travel mug keeps drinks cold up to 9 hours and hot up to 3 hours. The cup holder friendly shape makes it the perfect travel companion, to and from the conference room, the classroom or just your living room!. Top Rack dishwasher safe. Non-Slip silicone base. Fits most standard cup holders. Includes BPA-Free lid with removable slider for cleaning. Slip-free, scratch-free, noise-free silicone base. Constructed of 5mm 304 18/8 stainless steel. Dimpled design feels and looks like a real golf ball. Cold up to 9 hours, hot up to 3 hours. Triple Insulation Technology - Double walled, vacuum sealed, copper coated.