Yes. The fabric is made of 69% nylon and 31% elastane, and it's the elastane that holds the shaping in place.

Cold wash, no fabric softener, air dry and it keeps its compression.

Tumble drying and fabric softener are exactly what turn a shaping legging into a saggy one after 5 washes.

No. The seam follows the curve of the glutes instead of running down the middle, so it shapes without digging in.

That's the difference with most scrunch leggings: the seam sits in the wrong place, and you spend the whole session pulling it back into position.

Yes, you can train in these. The compression is concentrated on the lower belly and stays soft and flexible around the ribs and thighs.