Styrofoam cups are becoming a thing of the past. These are perfectly environmentally conscious solution to foam cups. Made by world renown JavaSOK, these are made of 4mm coated neoprene. This prevents condensation from building up in your cup holders or any surface you might place them on. No more embarrassing table rings and dripping cups. Easy on your hands and keeps your drink cold and outside dry. Machine washable. Imprinted Arches on one side. Exact fit for Large 30oz McDonald's cold soft drink cup and fits many other large cups by other restaurants as well.