The water bottle is made with food grade 18/8 stainless steel that is strong and rustproof for unique durability. The double walled metal bottle is insulated so it can keep your water or juice icy cold for up to 24 hours and your coffee, tea or cocoa warm for up to 12 hours! The drinking bottle is bpa-free and non-toxic so it can be eco-friendly and perfectly safe for you and your kids.