Summit Double Walled Mug 380ml capacity Durable stainless steel construction Double walled thermal insulation - 380ml capacity. Durable stainless steel construction. - Double walled thermal insulation. Non slip base. - Available in purple, green, blue or red. Please note - colour of the product may vary. A double-walled insulated mug to keep hot drinks hot and cold drinks cold! Extremely effective and with rubber for easy gripping, this is great for long journeys or camping trips.