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The frame with lenses and temples is indeed one piece, made out of tinted lens material with a silver mirror coating (Nike calls it a "white mirror") that hides the eyes. The frame has no hinges, kind of like a Pro M Frame.[...] That center crease the description of being a "single body" throws me off. There's also the implication of the lens being the same material as the frame.
The only separate pieces are the nosepad, the browpad, and the three-piece strap. The strap consists of left and right flexible segments that connect to the frame in two places on each side: the end of the temple and the lower outside edge of the lens. These left and right flexible-but-not-very-stretchable strap segments are joined in the back by one super-stretchy segment, which theoretically allows the glasses to fit different size heads.