The Momo Baby Silicone Bottle is the first of its kind with a 100 percent non-toxic odorless silicone body. It is BPA, phthalate, PVC, latex, and lead free. Due to the softness of the medical grade silicone, a two collar system is used to increasestability of the bottle. The lower secondary collar holds the bottle, and flow filter in place, while the main collar includes the cap and nipple as in standard bottle designs. The bottle comes with a slow flow silicone nipple and a flowcontrol filter. A flow control filter controls liquid flow, prevents nipple collapse, and reduces air flow.