The bamboo/silicone mug can be used for cold or hot beverages. It is made up of bamboo fibres and temperature resistant silicone. It is incredibly durable and 100% dishwasher safe. It is a lightweight alternative to stainless steel mugs or larger, clunky to-go mugs. It is easy to carry in a purse or smaller bag. It can last for many years if it is properly taken care of and cleaned.