The double-walled vacuum insulated stainless steel keeps your coffee hot for 4-6 hours. Its lightweight body is robust and is designed to travel. It has a double filtration system, that is 10x more finer than an average french press and once the press has been fully pushed down the extraction process stops. This prevents over extracted coffee, leaving you with a clear, clean, full bodied and hot brew. The filters are BPA, BPS and phthalate free. The Espro Travel Press is also suitable for the preparation of tea.