Born Free Grow with Me Cups encourage your child's independence. The guaranteed spill-proof and leak-proof cups are perfect for little ones at home or on-the-go. The interchangeable lids can be removed, and cups can be stacked for easy storage. The Easy View window lets mom see what's inside and an Easy Sip Rim has threads on the inside to provide a smooth surface for drinking when cups are used without lids for older children. Born Free Grow with Me Cups are naturally free from BPA and PVC and our top-rack dishwasher safe. Born Free 10-ounce Sippy Cup Features: Spill proof & leak proof guarantee Easy Stack for clutter-free storage Easy Sip Rim for open top use as child grows Easy View Window lets mom see what's inside Summer Infant, an award winning industry leader in developing infant and toddler products offers families safe and innovative solutions that provide peace of mind.