Nuby's Thirsty Kids Flexstraw Stainless Steel cup is great for travel and on- the-go sipping. Our toddler cup is leak-resistant and holds up to 12 ounces (360 ml) of liquid—perfect for staying hydrated! Nuby has designed the Flexstraw cup with a silicone valve that vents air around the straw to allow for easy drinking. This cup features a durable, 304 food-grade stainless steel cup base with fun prints to spark your little one's imagination. The stainless-steel cup base is insulated, keeping liquids cool while also keeping furniture protected from condensation. The silicone straw is designed to be easy to disassemble for thorough cleaning and convenience. Keep your little ones happy and hydrated with Nuby's Thirsty Kids Flexstraw Stainless Steel cup!