Double wall stainless steel vacuum construction with copper insulation, which allows beverages to stay cold for 24 hours or hot for at least 8 hours. The construction also prevents condensation on the outside of the bottle. Screw on lid with twist open leak proof cap allowing for 360º drinking. Wide mouth opening for easy cleaning and filling. On trend, durable powder coating. Volume capacity is 350ml. Lifetime guarantee for manufacturing defects with Got Your Bak.