Floating Cup. In regular mug designs, small amounts of moisture runs down the side and meets the surface on which the mug is being rested, causing the stains and rings that damage your furniture. With the Floating Mug, this tiny amount of moisture collects in the small basin below the mug. Most will evaporate within moments and your furniture will be stain free! The amount of moisture is so small that it won?t spill as you go to take your next sip either. Microwave Safe: Yes, Dishwasher Safe: Yes, Capacity: 300ml, Weight: 250g.