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