Cute Design - Eye-catching design with high quality food grade 304 stainless steel on inside wall and 304 stainless steel on outside wall, scratching resistance, 100% BPA Free for heath-safety.Keeps the Temperature - The double-walled stainless steel water bottle is vacuum insulated and therefore keeps the temperature for several hours. Cold drinks stay cold for up to 12 hours and hot drinks stay warm for up to 6 hours.Leak-proof Lids DesignWith Intelligence Game where kids can play and learn mathematicsWater Bottle Capacity - 400ml capacity is good for children Note: Do not fill with hot water over 50 ? when using the straw cover lid, because the high pressure will push the hot water out through the straw, it's very dangerous for kids.