Gelert Thermal Mug. Gelert Thermal MugThis Gelert Thermal Mug is ideal for outdoors, travelling, in the car or the office to keep your drinks hot or cold with a 350ml capacity, a screw top lid to keep the contents secure.> Travel mug> Screw top lid> Stainless steel> Double wall design for optimum insulation> Polished internal> Gelert branding> Capacity: 350ml