Our brains are like supercomputers, and water is like their favorite fuel. Drinking water keeps the brain's "thinking power" turned up, making it easier for kids to learn new things, solve puzzles, and enjoy school. Little + Happy water bottles are parent-approved and kid-tested in California. They are stainless steel double-walled, vacuum insulated, leakproof, and made from the highest quality, food-safe materials. Constructed with 18/8 food-grade stainless steel and BPA free. The sippy straws are food grade silicone. Our bottles are designed to keep drinks hot and cold for 12 hours.