Injection molding method

An injection molding method, comprising:

• engaging a first mold with a second mold to form a first mold cavity;
• injecting a first flowable material into the first mold cavity;
• foaming the first flowable material to form a first component inside the first mold cavity;
• disengaging the first mold from the second mold;
• replacing the second mold with a third mold;
• engaging the first mold with the third mold to form a second mold cavity defined by the first mold, the third mold, a fourth mold fixedly attached to the third mold and a third component at least partially surrounding the fourth mold;
• injecting a second flowable material into the second mold cavity;
• foaming the second flowable material to form a second component inside the second mold cavity;
• disengaging the first mold from the third mold;
• and
• detaching the first component, the second component and the third component from the fourth mold,
• wherein during and after the disengagement of the first mold from the third mold, the first component is attached to the second component and the second component is attached to the third component.