Camelbak Rocks Tumbler Stainless Steel Vacuum InsulatedThe strong and durable 350ml Camp Mug is constructed in double walled, vacuum insulated stainless steel with a powder coat finish, keeping it looking good on the outside and piping hot on the inside. The tri mode tumbler lid slides open for flow control and is spill resistant. A non slip silicone pad on the base provides a soft landing on surfaces to avoid scratches and spills. Dishwasher safe and free of BPA, BPS, and BPF. Vacuum insulated: Double