The 16oz Insulated Tumbler features double-wall construction. It also includes a straw and a press-on lid with slide-closure for easy use with hot & cold beverages. The reusable straw is made of 18/8 food grade stainless steel material and is perfect for drinking cold beverages. Comfortable sipping experience with the silicone tips. The stainless steel straws are Eco-friendly, environmentally responsible, and sustainable as they are reusable and dishwasher safe. Straws are included not inserted. Hand wash only and follow any included care guidelines.