The YETI Rambler 20oz Tumbler with Magslider Lid in Reef Blue is a two-piece set that includes a solid color tumbler with a drink-through lid. Made of stainless steel and BPA-free plastic, this tumbler can keep your beverages cold for up to 12 hours. With a 20 fl oz capacity, this tumbler is suitable for both hot and cold drinks, and is machine washable for easy care. The Magslider Lid ensures a secure seal against spills, making it a convenient and durable option for on-the-go use.