The Wave features double-wall marine grade stainless steel construction with a vacuum seal keeping liquids inside at a constant temperature for hours. Its ergonomic shape makes it easy to hold. The threaded lid is also a 4 oz. drinking cup, while it’s Touch N' Pour Stopper makes dispensing water easy with 360 degree pouring ability. The Wave features a 5 year warranty and the Touch N' Pour stopper features a 2 year warranty.