A Vacuum Flask, or Thermos, does not allow heat transfer by any of the three ways that heat can travel. The silver coating on the inner bottle prevents heat transfer by radiation, and the vacuum between its double-wall prevents heat moving by convection. ... The case surrounding the flask provides additional insulation.
100% leakproof. Suitable for keeping water, juice, coffee warm, fashionable design & personal customization. Metallic color gives the bottle a polished look with a double-walled stainless-steel liner. Keeps your beverages Hot or Cold for 12hrs.
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