The Delta InsulMug has been designed by Sea to Summit to be the ultimate insulated expedition / outdoor mug. These lightweight mugs feature Sea to Summit’s patented Protex™ hex pattern base which reduces weight and disperses surface temperature. The Delta InsulMug features a ground-breaking advance in thermal insulation: a molded non-absorbing closed-cell Thermoskin. A snug-fitting, self-draining lid allows drip-free sipping. Ideal for expeditions, camping and daily commuting. Bu combining the Protex Hex-Pattern base and cool touch ergonomic rim your drink stays hot and your hands stay cool.