The 17oz bottle is the ideal water bottle size, great for staying hydrated all day long. Keeps your drinks cold for 24 hours, hot for 12. 18/8 double-walled stainless steel, non-toxic, Non-leaching, phthalate and BPA free and ethically-sourced to protect your health and the environment. Vacuum sealed, bottles do not condensate. The satin collection is featured in a semi-matte finish.