The First Years Sippy Cup BPA-Free, 4-Pack Bundle, BPA Free: * Features magical color change technology - the cup changes color when you poor in a cold beverage, and returns to its color when the beverage reaches room temperature * Uniquely sculpted lids * Convenient 4-pack of insulated sippy cups * Double-wall insulation keeps drinks cooler longer * Easy-clean valve system - the valve is built into the lid -- no small pieces to lose * Dishwasher safe * BPA Free * Ages 9 months and up