The Thermos 400ml Stainless Steel Inner Plastic Outer Travel Tumbler keeps your drink at the perfect temperature while you’re on the go. The double wall insulation retains hot or cold temperatures. This means the tumbler is cool to touch when filled with hot liquids, and sweat proof when filled with cold. Made with a stainless steel inner and a durable plastic outer, the Thermos 400ml Stainless Steel Inner Plastic Outer Travel Tumbler is long lasting and can withstand everyday use. Conveniently sized to fit in into car drink holders for easy transportation, the tumbler has an easy access twist lock lid; perfect for people on the go.