A method of forming a fluid-filled implant is provided. The method includes: forming a first zone of an elastomeric membrane defining at least one partially enclosed void space； expanding a volume of the void space, thereby expanding a volume enclosed by the first zone； forming a second zone comprising at least one elastomeric middle layer on at least a portion of the expanded first zone； and reducing the volume of the void space, thereby contracting elastomeric layers of the first zone and the second zone. The method also includes forming an adjustable implant from the elastomeric membrane by enclosing the void space to form at least one chamber.
