It is made of double wall borosilicate glass,it is safe for both boiling and ice water and BPA Free.Stainless steel filter Fine distribution of tea mesh, quick separation of tea and water, filtering tea residue.Leakproof:Sealing strong,Rotary pot cover,built-in silicone seal ringcan leakproof effectively.Easy to carry The weight is light,hold it with your hand or strap it to your bag wherever you go.