Kids learning to drink from a "big kid" cup will enjoy the Siliskin-Glass, a clean alternative to plastic drink-ware. BPA-free, and made from 100 percent  food grade silicone, the Siliskin 6oz Glass helps prevent slipping and adds extra protection to the glass inside. The Siliskin is hypo-allergenic, has no open pores to harbor bacteria, is dishwasher safe, and can be boiled to sterilize. Comes in a four pack with an aqua, lime, red and purple glass.