Promotional Borealis Recycled Stainless Steel Straw Tumbler - 475 ml Sip in style. The Borealis Tumbler is perfect for enjoying hot and cold drinks on the go. Featuring double-wall vacuum insulation, it keeps hot beverages warm for up to 8 hours and cold drinks chilled for up to 10 hours. The tumbler's body is made of stainless steel and sports a sophisticated matte metallic finish. It comes complete with a spillproof press-on lid and a colour-matched straw for effortless, on-the-go sipping. Ideal for daily use, it is both durable and stylish. Not suitable for dishwashers or microwaves.