LET’S DRINK TO THIS! Snug Silicone Stretchy Spout Lids fit over any regular cup, with a 2.5 Inch - 3.75 Inch diameter, turning it into a sippy cup. It instantly prevents that cup from spewing its contents when knocked over or tossed off a high chair. Snug has a spill-proof valve for kids old enough to drink through a sippy cup but not old enough to stop spilling them. Place the sippy cup accessories in a dishwasher to clean away all the dirt.