Made of double-wall borosilicate glass, this portable travel tea infuser is safe for both boiling and ice water and is BPA-free. The stainless steel filter features a fine tea mesh for quick separation of tea and water, effectively filtering tea residue. It is leakproof with a strong seal, rotary pot cover, and built-in silicone seal ring. Lightweight and easy to carry, you can hold it in your hand or strap it to your bag wherever you go.