Thermos Stainless Steel, Foam Insulated, 15-Ounce Desk Mug (Silver) Stainless Steel Foam Insulated Desk Mug Unbreakable stainless steel interior and exterior Ultra-durable desk mug for hot and cold beverages; 15-ounce capacity Stays cool to the touch with hot liquids and is condensation-free with cold Leak-proof lid with one hand push button operation