Patented-pending, easy-to-drink spout for natural sipping motion - no loud sucking noises when drinking;Unique latch makes it simple for little hands to open and lock tight;Leak-proof cap and bottle - cap stays open when drinking, and keeps drinking spout clean when closed;18/8 high-quality, food-grade stainless steel - no lining or metallic taste;No plastic in contact with your drink - BPA, lead and phthalates free