Well made to control flow and promote child safety. It is smooth and comfortable. Easy to be cleaned, non-slip handle, easy for kids to grip. Safe to bite anywhere in the mouth of the cup to drink water. Built-in valve, leakproof and spill proof. It is the perfect cup for teaching little ones to drink on their own and also for Kids who already know how to drink from a cup or bottle.. This cup features a unique finishing to guide lower lip positioning and is gentle on the gums but durable enough for children with teeth.