From sunrise to sunset. The strong and durable powder coat finish keeps the Camp Mug looking good on the outside, while copper vacuum insulation keeps drinks at ideal temperature on the inside. The tri-mode tumbler lid slides open for variated flow and is spill resistant when closed. A non-slip silicone pad on the base provides a soft landing on surfaces to avoid scratches and spills. 6 Hours Cold, 4 Hours Hot. Hand was only. 12oz. 18/8 Grade Stainless Steel inner wall with Stainless Steel Outer.