Why do bras have side boning?

Bras incorporate side boning to deliver targeted structure where you need it most: along the band's side seams where fabric is most prone to rolling, bunching, or losing its shape throughout the day.

These narrow, vertical stays (typically flexible plastic encased in fabric) work to keep your band smooth and upright while helping center your bust forward for a streamlined silhouette that makes clothes fit better.

Side boning becomes particularly important in strapless and wireless designs, where the band must provide all the support without relying on straps or underwires. The reinforcement also helps prevent the "east-west" appearance that can occur when bust tissue spreads toward the underarms, instead encouraging forward projection.

For high quality wireless bras that feature side boning, check out Honeylove's collection of wireless bras.