Nuby's Clik-It Silicone Straw Trainer Cup will stop parents from worrying about spills and leaks! The lid "clicks" when twisted into place, so you know it's securely attached to the cup base. Nuby's Clik-It Silicone Straw Trainer Cup has a soft silicone straw designed to be gentle on gums and teeth. Little ones are animated and active, even while holding (or occasionally dropping) their drinks. That's why Nuby designed a flip-top cap that helps ensure a leak-resistant cup. The cup features a 360° weighted straw that moves to the liquid wherever the cup is tilted, allowing your child to sip to the last drop. Whether your little one stays still while sipping, or prefers to keep on the move and hold their cup at an angle, Nuby has you covered. The Clik-It Silicone Straw Trainer Cup holds 8 ounces (240ml) of liquid, keeping little ones happy and hydrated.