The YETI Rambler 35oz Straw Mug with Straw Lid is a durable stainless steel mug that keeps drinks cold for hours with double-wall insulation. The 35oz size offers plenty of capacity, and the straw lid allows for easy, spill-resistant sipping. Its made from tough, rust-resistant 18/8 stainless steel and is dishwasher safe for easy cleaning.