It is a semi-padded bra with a higher bridge ideal for medium neckline.
It gathers the breasts in a way they do not stick outside the contour of the body.
Lifts the bust giving it a rounded shape.
The base of the cups is made of stable knitwear, a bit firmed up in a special technological process, gathering and lifting the bust up as well as holding it at the right level.

The top part of the cups made of lace reinforced with a layer of elastic beige tulle to keep the bust tight and make the intricate pattern of the lace visible. Because of that the cups are very supportive and adjust to the shape of breasts, even if asymmetrical as well :).
The bottom of the bra made of lace

Fully adjustable straps.

Decorated with tiny bows on the straps and a tiny silver crystal on the center gore.

 
The width of the band, the coverage, the straps and the height of the bridge are adjusted to the bra size.
Sizing in SF style is comparable to BM style, meaning they feature a bit bigger cup volume than padded bras and you might need to size down.
If in doubt about the size, try the smaller one.