The new 9oz Kiki bottles from Pura are available in both an infant and a sippy bottle version. They are designed to keep liquids warm for up to 6 hours and cold up to 8 hours! These bottles use the same stainless steel collar as the original Kiki bottle so like all products in the Kiki line, the insulated versions are compatible with all Pura silicone nipples, spouts, and sealing disks. Also, like the traditional Kiki bottles, the insulated bottles operate with nipples and spouts from many leading manufacturers.