New Premium Titanium Insulated Thermoses Travel Mug for Men & Women, High-Quality, Tea Separation, Portable, Car-Friendly, Stylish Gift Water Bottle 200ML 6OZ This is made of double-layer pure titanium, with a typical insulation duration of 6-8 hours. Its advantages include resistance to oxidation, properties, and being completely harmless to the human body. When you use it for beverages or coffee, the performance be that of stainless steel.