All of the double wall stainless steel lined Thermos Nissan products you will find at BaldMountainCoffee.com, are top of the line Thermos Nissan, which include the Thermos TherMax &174; vacuum insulation technology. We do not carry Thermos Nissan products that are insulated with foam. Although Thermos does manufacture other, less expensive lines of products that do not include their TherMax &174; technology, we carry only only Nissan Thermos products that DO include TherMax &174; technology, as we feel they are far superior to what else is offered.

As with all insulated beverage containers, we highly recommend pre-heating these units by filling them with hot water - or cold water, and leaving them sit for a minute or so before storing your beverage. This will greatly increase the amount of time your beverage will hold its temperature. Thermos TherMax &174; vacuum insulation virtually eliminates temperature change by creating an airless vacuum space between two unbreakable stainless steel walls. The result is an insulation layer that performs better than almost all other insulation methods, excluding glass lined containers, which are for the most part, not suited for more rugged environments. Thermos TherMax &174;, Superior insulated containers that keep whats hot, hot, and whats cold, cold!