The YETI Rambler 20oz Tumbler with MagSlider Lid is a durable stainless steel cup that keeps drinks hot or cold for hours with double-wall vacuum insulation. The MagSlider lid uses a magnetic closure to help prevent spills while providing easy access to your drink. The tumbler is dishwasher safe and perfect for everyday use or on-the-go hydration. FAQs Will it fit in my cupholders?Yes. Our Stackable Cups are designed to join you on the drive, in the boat, and around the fire and should fit in most cupholders. Is it dishwasher safe?Yes. We recommend lids on the top rack, and gaskets and magnetic slider in the utensil&';s basket. Of course, you can always hand wash, but we know you&';re busy on your next adventure. Can I use it for hot and cold drinks?Yes. Keep in mind that using it for cold drinks immediately after a hot drink may affect its cold holding ability, and vice versa. Do not use straw lid with hot drinks.