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The silicone outer piece is secured to the black plastic frame pieces by inserting the silicone attachment points into openings in the plastic frame.
Here you can see the front with all four pieces attached to the case. The display is well protected from the elements by the integrated protector.
Here is a shot of the back with the case pieces all assembled. Note that there are silicone covers for the ports and the stand attaches to either side of the case.