The Victor Copper Vacuum Insulated Tumbler 20oz features double-wall construction designed to keep beverages hot for up to 8 hours or cold for up to 24 hours. With a condensation-resistant exterior, push-on 100% recycled SAN lid with Tritan slider, and easy-to-clean wide opening, this 20oz tumbler is designed for convenience. It features a ribbed grip design and is made from 91% post-consumer recycled 18/8 stainless steel with copper vacuum insulation. Hand wash only.