A rough and tough tumbler that'll keep up with you throughout your travels and adventures. Yeti's Rambler 20 oz Tumbler with MagSlider Lid is made from durable stainless steel with double-wall vacuum insulation to protect the hot or cold temperature of your drink. The tumbler, lid and magnetic MagSlider are all dishwasher safe. 20 oz (591ml) tumbler Double-wall vacuum insulation Keep cold drinks cold & hot drinks hot Lid & MagSlider included 18/8 stainless steel Magnetic MagSlider for easy opening and closing Fully dishwasher safe Puncture & rust resistant No sweat design prevents hand condensation Magnetic MagSlider is not leakproof and will not prevent spills if turned upside down.