A wide, fairly rigid wire paired with stretchy seamed cups. The center-pull straps should be good for those with narrower shoulders.
The cotton lace overlay gives the stretch jersey cups some additional support, but this is much less shaping than bras by Elomi, say. I get a softly rounded shape with my full-on-bottom, soft breasts, but not a lot of lift. The wire fits me as if it were designed for my wide, shallow breasts, so this is supremely comfortable. One quibble: The elastic edge at the top of the cups tends to roll under, which can leave a visible ridge under close-fitting knit tops. I wear this under woven shirts, instead.
At first glance, the bra fits because the cups stretch. Though I suspect a larger cup size would fit better. The Carolina is very pretty in person, it has a diagonal seamed full coverage plunge cup with a firm underwire. It's very light weight.
The fabric feels like soft nylon and is comfortable against the skin. The construction is very simple, it has a a stretchy black lace overlay placed over a beige fabric to fake "nude" skin (for lighter to light-tan skintones).
My issue with the Carolina is how tight the 32" band is! It's tighter than my 30FF from Freya or my 30G from Simone Perele. I need an extender for the Paramour bra because the tightness of the band mades the underwire press against me uncomfortably.
The straps are not fully adjustable due to their design, but I can tighten it sufficiently enough to fit without issues.