Design details: 18/8 double-wall stainless steel, vacuum-sealed construction maintains the optimal temperature of cold beverages. Keeps your drinks cold for 8 hours, hot for 4 hours. Durable, thread less Tritan lid easily slides open and closed for one handed drinking. 30oz capacity fits in a standard sized cup holder. BPA -Free. Measures 3.85in x 3.85in x 8.5in; 30oz capacity Hand wash only Imported