This spouted lid adds safety to our Ergo cup. Occupational therapists and carers can choose between two functions: - spill-proof lid : the airtight lid prevents spillage when the cup is knocked over. The user must suck to drink. - or a free lid : simply perforate the top of the lid to allow air to circulate. The liquid flows out without suction. However, if the cup is knocked over, the liquid will spill more easily. Dishwasher and microwave safe.