Beautiful in its simplicity and deliberate in its design: No plastic. Just three materials (Stainless steel, bamboo and silicon gasket) united into the water bottle. The Stainless Steel Unibody Bamboo Cap is crafted from a single piece of stainless steel and finished with a beautiful piece of sustainably harvested bamboo. The stainless steel loop makes the bottle easy to hold and transport and the food grade silicone gasket is safe, removable, easy to clean and replaceable when needed. * Double Wall Vacuum Insulation, Keeps Cold up to 24 Hours, Keeps Iced up to 40 Hours Food Grade 18/8 Stainless Steel, Food Grade Silicone, Sustainably Harvested Bamboo Construction Come with Stainless Steel Unibody Bamboo Cap. * Large 1.75 inch (44 millimeter) opening for easy filling and pouring.