Unique Anti-Valve Technology: Our This toddler water bottle is leak, shake, and spill-proof for less mess and less stress even when upside down or shaken Bite-Resistant Spout: Sporty Spout is designed with a durable spout that is gentle on little mouths but tough enough to withstand tiny teeth learning to drink out of a sippy cup Double Wall Insulated Design: Our insulated sippy cups are designed to keep drinks colder to encourage toddlers to drink and stay hydrated Antibacterial Technology: Our weighted straw is made with antimicrobial technology that helps reduce bacteria by up to 99.9%* Toddler-Safe And Easy To Clean: All pieces are dishwasher safe and BPA free with your child's safety in mind