Click-Lock™ Opening & Closing Mechanism for Leak Proof Seal. Features Hello Kitty™ designs. Insulated to keep drinks cool. Clear outer with color tinted inner cup so mum can see fill level. 3 colors in range. BPA free Munchkin s new range of Click Lock™ Cups are just right because they just click. These cups feature a simple click-and-lock lid to securely close for a leak proof seal - guaranteed. Parents will see, hear and feel the cup lock, so they have triple assurance against dribbles and drips. Click Lock™ cups are available in an assortment of vibrant colors.