Naturehike Insulated Stainless Steel Water Bottle with Double Wall Vacuum-insulated 600ml/ 900ml 100% true premium grade- 18/8 Stainless Steel, made from one of the earths purest & safest materials; Zero Toxins, Zero BPA, no plastic lining in bottle or on the lid lining Keeps liquids Cold 20 HRS | Hot 15 HRS- Double wall vacuum insulated stainless steel water bottle keeps drinks cold for up to 20 hours and hot for up to 6 hours; keeps water hot and cold while saving energy and money 100% leaf proof and sweat proof - 600L and 900L high capacity with high quality colorful powder-coated matte finish exterior that never sweats Perfect Quality- Powder-coated, matte black exterior keeps sweat and fingerprints off, offering easy maintenance and excellent grip, vacuum technology and dood sealed performance without peculiar smell 100% Satisfaction- Non Toxic with Zero Metallic Taste, does Not Retain or impoart flavors from your drink