Hello. TempShield: Our unique insulation keeps your drink cold for 24 hours so you can stay refreshed for any adventure. 18/8 Pro-grade stainless steel. Color Last coating. Dishwasher safe. The Hydro Flask difference. Temperature: TempShield Double Wall Vacuum Insulation. Taste: 18/8 pro-grade stainless steel won't retain or transfer flavors. Transport: Colo Last powder coat for easy grip, sweat-free surface and ultimate color retention. Parks For All: We provide grants to non-profits benefiting parks. Learn more at: hydroflask.com/parks-for-all.