A drinking vessel is provided with an insulated wall structure including an inner
wall, an outer wall, and a void between the inner and outer walls providing an
insulative barrier for maintaining the temperature of the liquid contents within
a desired range for extended periods of time, while also preventing the formation
of condensation on the outside of the vessel. Luminescent elements, such as shapes,
letters, numbers or designs, are applied to the insulated wall structure to enhance
visibility of the drinking vessel and the level of liquid beverage contents when
in dark or low light conditions. In an alternative embodiment, the luminescent
material is incorporated into the composition of the wall structure during the
molding process. A removable lid may be provided for covering the open top of the
drinking vessel. In one embodiment, the drinking vessel and removable top lid are
structured and disposed to provide a child's sip cup, wherein the lid includes
an integrated sip spout and valve for resisting spills.
