The Primula Tea Bag Buddy is a generous (16 oz.) sized double wall glass mug that retains the heat or cold of its contents very effectively. Too effectively perhaps. When swapping out my usual coffee mug for the Primula model, the water stays almost too hot to sip for a much longer period of time. This heat retention is great for brewing, but it makes it difficult to enjoy the tea right after seeping. For ice tea it is great since it keeps the content as cold as it keep brewed tea hot. The mug looks … more