The Hydro Flask 32 oz Wide Mouth Stainless Steel Water Bottle is made for serious hydration and sustenance portability. Made of double wall, vacuum insulated, food grade 188 stainless steel. Vacuum flask will keep contents cold for 24 hours or hot for 12 hours. Vacuum design also prevents scorched hands from hot drinks and condensation from cold drinks. 188 stainless steel is naturally resistant to odors and bacteria. Ice cubes from standard refrigeratorfreezer door ice dispensers fit perfectly. Matte finish.