Plastic threaded lid and Silicone suction nozzle: Our tumbler is equipped with a threaded lid, which will not leak water after tightening and silicone nozzle prevents the straw from puncturing the mouthHigh quality silicone sleeve: The silicone cover covering the entire tumbler prevents your hands and bottom of tumbler from slippingHigh Quality Material: The interior and exterior of our insulated cups are made of food grade 18/8 stainless steel, which is made of BPA-free food grade material. This is safe and healthy for your entire drink and durable. And it is also the best gift for women.Washing by hand: The bottle can be cleaned with a dishwasher (excluding lid, silicone sleeves and silicone nozzles). Of course, washing by hand can extend the service life of the tumblerNot Fragile and More Sturdy: Our coffee cups are stronger and less fragile than glass cups.