Safety Shield made from Silicone

features   New safety feature!—Fits only within a fully assembled Sip and Straw Cup made from Glass to provide extra protection for your little one by preventing glass from entering the drinking spout in the case of glass cup insert breakage. 100% food-safe, platinum-cured silicone helps avoid harmful chemicals—Made without PVC, and hormone-disruptors like BPA for your baby’s health and safety.  Easy to assemble—Simply insert the safety shield into the collar of your baby’s sippy cup until it is flush inside the sippy or straw spout, with the large straw connector facing down. Insert the flat end of the straw into the straw connector to correctly assemble.  Only use within fully assembled cup—Although our glass is considered the safest, chemically-stable material, we understand that it is still a fragile material. Please use under adult supervision and check often for breakage.