The Hydro Flask Wide Mouth Hydration 32 Oz Stone is durable 18/8 professional-grade stainless steel with a wider opening for faster fill. The TempShield™ double-wall vacuum insulation keeps water ice cold for up to 24 hours and hot for up to 12 hours. It features a Color Last™ powder coat which is dishwasher safe. It is dishwasher safe, BPA free, and Phthalate free and comes with a lifetime warranty. It is compatible with the Wide Mouth Flex Sip™ Lid and Wide Mouth Straw Lid.