The ideal implant has multiple shells or baffles, depending on the size of the implant used. It does have two valves one on the front side and one on the back. The valves are flat and you can not feel them through the skin. Most leaks in any saline implants are not from the valves but from fold flaws or creases. The IDEAL implant has minimal rippling and feels very natural. I am a big fan. Hope this helps, Jane.