The First Years Spill-Proof Gripper Sipper cups are a hit with moms and kids! Moms love the easy-to-clean One Piece Lid which features a spill-proof valve system that is built into the lid! The First Years Spill-proof One Piece Lid has no small pieces or parts to lose at daycare or down the garbage disposal! The cup is designed to be easy for children to hold with a no slip grip! Dishwasher safe and BPA free.