At the age of 15, which is arguably the fastest and most obvious stage of a girl's breast growth, breasts are getting bigger and taller all the time, and their shape becomes fuller and closer to a petite hemisphere shape, but not yet rounded enough. The color and area of the areola is also getting darker and larger, and the edges of the areola have also appeared in the form of a shallow circle of dimples characteristic of mature women, with the nipples high on the crests of both breasts.

Sports underwear is the underwear that girls wear when doing sports. The main functional feature of sports underwear is to wear a tight tank top model, coupled with a high elasticity of the material fabric, which in turn plays a better fixed breast, to prevent girls in the movement of the time, the chest wobbling around, to reduce girls due to strenuous exercise and breast pain or sagging feeling and so on.

The difference in function: sports underwear is to maximize the protection of the breast, reduce the frequency of shaking, often using the style design of compression breast. It is important to know that the compression of the breasts is to increase the contact area between the breasts and the pectoral muscles to improve the friction and thus reduce the frequency of swaying. Therefore, sports underwear in order to have the effect of compression of the breast, it is necessary to have a backward force on the breast to do so.

Material fabric difference: the positioning of sports underwear is the girls wear underwear for sports, in the fabric to high elasticity, fast dry, sweat perspiration.

The main function of ordinary underwear, that is, the underwear worn in daily life, is to properly fix and support the breasts. Therefore, ordinary underwear must have an upward pulling force, so as to resist the gravitational force of the chest downward.

Material fabric difference: daily wear of ordinary underwear, consider more suitable for long-term wear, therefore, the fabric (at least cup lining fabric) to comfortable, generally using cotton or blended cotton fabrics to improve the wearing comfort of underwear, but this will not be conducive to the process of sports heat, perspiration and quick-drying requirements.

From the above 15-year-old girl's chest growth and the difference between sports underwear and ordinary underwear, it is not difficult to determine that the 15-year-old girl who is growing up should not usually wear sports underwear. You should know that sports underwear can be tightly wrapped around the chest, the movement is very stable, but, if worn every day, it will squeeze the chest deflated, strangled tight, directly affecting the blood circulation of the chest, and the development of girls wearing sports underwear daily, it is easy to cause chest expansion, flattening and other chest deformation problems, to recover is very difficult!