Designed in the USA and made of heat-safe silicone, the Hot Lips are a solution for drinking from hot single-wall titanium mugs. Simply place on the edge of the mug for comfortable sipping. Set includes two units of Silicone Hot Lips. Please note: Hot Lips should be hand washed with detergent and air dried. Hot Lips pair with any single-wall titanium mug or piece from the Trek Cooksets.