Two pieces, one size to get right
A set is bought in one size and worn as two garments, and the two do not agree about what size you are. The leggings want the hip; the bra wants the underbust. There is no way to buy them apart, so the compromise happens on your body. If you know your legging size, take that one: the bra is a pull-on with a wide band and no adjusters, so it gives about a size either way.
Three colours — black, navy and plum — across five sizes, XS to XL. The fifth bullet says three sizes and then the selector offers five. Trust the selector.
The straps do the work of a racerback
Each shoulder carries one thin strap. They leave the front edge, cross once at mid-back, and finish at the opposite lower corners of the band. The X does what a racerback does — pulls the shoulder points inward, which keeps a thin strap from sliding off — without the panel across the shoulder blades that a racerback needs to get there. Nothing touches the blades, which is the reason to pick this shape over a racerback.
What the crossing does not do is adjust. The straps run continuously from the front edge to the band, with no slider on either, so the length is set at the factory and the crossing cannot be raised or lowered. On a longer torso the X sits higher than on the model.
A scoop edge, not a square one
The front is a low, wide scoop. The listing calls it low-cut, which is fair. There is no binding along it: the edge is folded and knitted down, so it lies flat against the chest instead of standing proud, and it will not hold a shape of its own. A scoop follows the body. The square-neck version of this set carries a heavier band along the same edge, and that band is what keeps the corners square after a winter of washing.
The band is what carries it
Under the bust there is a wide elastic band, roughly two fingers deep, joined to the cup along a visible horizontal seam. That band holds the bra up; the straps only set the angle. On a pull-on bra the band is the part that has to fit, and the part that cannot be adjusted.
The pads are removable, and the opening sits at the bottom of the cup rather than the side. Take them out to dry the bra overnight, leave them in for shape. A padded cup also stops the knit printing.
The scrunch that is not in the photographs
The third bullet says scrunch butt, and pairs it with a V-shape back. Neither is visible in any of the eight photographs. There is no gathered seam down the centre of the glutes, and the waistband runs level across the back instead of dipping into a V. Two readings are possible: either the seam is inside the garment, as on the square-neck sister of this set, or the sentence came across from a template. We will not promise it. What the photos show is a smooth seat with a curved panel line around the outside of each glute.
Seamless means nothing to let out
The leggings are knitted as one tube: no side seam, no front rise seam, no pocket, no opening at the waistband. A legging without a front seam is the answer to the camel toe problem, and it is why this pair works with a top that ends at the waist. The cost is the same as on any seamless garment — no seam allowance anywhere, so nothing can be taken in or let out.
The waistband is wide and sits over the navel. The compression in it is knitted in rather than sewn on, which is why there is no horizontal seam across the front, only a denser band of stitches. Leg length is full, to the ankle. The fabric is 90% polyamide and 10% elastane throughout, and the page claims squat-proof; we repeat that as the page's claim, not as a measurement.
What it is not
Not the square-neck set, which has a bound neckline, no crossing at the back, no pads and a contrast stripe on three edges. Not the double-layered set, which has two straps per shoulder and a V panel under the glutes. And not a bra you can buy on its own — the top is sold only inside the pair.
Three sets from one line, one size each, and every difference between them sits at the neckline, the back or the seat.