For use with Pacific Baby thermal 3-in-one and all-in-one bottlesnConversion from bottle to leak proof thermal toddler cup 12 months plusnKeeps your childu0026#39;s drink warm or coldnBPA, PVC and Phthalate free and safety testednThe Pacific Baby toddler drink straw top is used to convert a Pacific Baby Thermal Baby bottle into a for your child's toddlerhood and early primary years. It is compatible with the 4 ounce and 7 ounce 3-in-one bottles and the all-in-one bottle and will keep your child's drink warm or cold for up to 6 hours (4 ounce) or 10 hours (7 ounce) which is extremely useful when you are out and about. This environmentally friendly accessory increases the product life of the bottles for up to 5 years and you don't have to buy more plastic drinks bottles as your child grows.