Glasses like these are a popular and modern choice for water in hotels, cafes and restaurants. However, the rounded shape is difficult to make in durable dishwasher-safe plastic, which is why they are hard to find at a price that is reasonable. In addition to their beautiful shape, they are made from a material called Tritan - an unbreakable scratch and dull resistant material similar to polycarbonate, that is BPA-free.
