ordinary vacuum flask has poor heat preservation
stainless steel vacuum flask has the function of heat preservation and cold preservation.please enter my shop to find the product you need.La dernière tasse avec poignée, verre à bière créatif à double couche, isolation thermique et articles ménagers anti-brûlure LLD10875 stainless steel mug is made of stainless steel 304, and the cup comes with anti-slip function..