Plastic bra is designed according to the principle of fat movement. On the basis of the ordinary bra, the lateral width and the width of the heart position are increased, and the underarms and auxiliary breasts are added. From the lower edge of the adjustable bra cup to the outer rib side, there are special functional fabrics, which strengthen the endurance and support, and make the chest show graceful curves more easily and permanently. The combination of L-shaped steel ring and breathable silk floss embodies the three-dimensional round effect. Widened rib side guard and strong elastic lining make it more stable and safer to wear.