Non-wired, a 2 size-reducing effect T-stitches that support the chest from the bottomAdjustable non-sticking strapsAdjustable hook-ups This product contains 83 Polyamide 17 Elastane container 92 Polyester 8 Polyamide The diagonal straps that go under the chest and the T-stitching on the chest add extra form to the chest by 2 sizes. Thick and sturdy straps distribute the weight of the chest evenly. It provides freedom and the lace details give it a stylish look. Polyamide is the first synthetic fiber produced. It's durable. Suitable for use for a long time. Polyester is a flowing and light fabric. Durable, Flexible. Shiny, Elastane. Flexible. Suitable for long-term use, wraps the body and maintains its shape.