GSI has come up with an incredibly clever design which replaces the awkward plunger rod with an inner mug providing a double wall of insulation. The flip top lid seals in heat and drips, yet unscrews for easy access to stir or add in cream or sugar. Insulating foam sleeve provides an additional layer of warmth, while offering a soft grip. BPA free, is lightweight and shatter-resistant. 15 fl oz.