Our PolyMugs or Sublimation Mugs, are made of a specially formulated polymer and are safe, durable, sublimated coffee mugs that can be used anywhere by anybody: at swimming pools, outdoor cafes, coffee shops, patios, boats, marinas and any other place where breaking a ceramic or glass mug would cause a serious safety hazard. Along with the durability, it is light weight which makes it ideal for use by children and the elderly. They are similar in size as our 11-oz ceramic coffee mugs.