TempShield double-wall vacuum insulation Multi-use design works as a can or bottle cooler and a 12 oz beverage cup Fits most cupholders Flex Collar locks in the cold with a snug fit for bottles and cans, or stabilizing boot Made with 18/8 pro-grade stainless steel Color Last powder coat BPA-Free & Toxin-Free Dishwasher safe 12 oz Cooler Cup compatible with Hydro Flask Closeable Press-In Lid and Press-In Straw Lid