The Yeti Ramblers can be used for anything. The Rambler® 30oz. is made from durable stainless steel with double-wall vacuum insulation to protect your hot or cold beverage at all costs for hours on end. Like the entire Rambler Family, the 30oz. Tumbler and its lid are dishwasher-safe for easy cleaning. The magnet on the included MagSlider™ Lid adds an additional barrier of protection for preventing heat or cold from escaping.